MCCQE Medical Council of Canada Qualifying Examination Part 1 Exam Questions and Answers

Comprehensive and Detailed Explanation:

The child’s presentation (weight gain, short stature, truncal obesity, facial swelling, hypertrichosis) is classic for Cushing syndrome. One of the hallmark findings on physical examination in pediatric Cushing syndrome is hypertension, due to increased cortisol-mediated mineralocorticoid receptor activation.

Toronto Notes 2023 – Pediatrics / Endocrinology:

“Cushing syndrome in children presents with growth failure, weight gain, moon facies, truncal obesity, and hypertension.”

MCCQE1 Objectives (Pediatrics > 77-2: Endocrine Disorders in Children):

“Candidates must identify clinical signs of hypercortisolism and evaluate for associated findings such as elevated blood pressure.”

Café-au-lait spots (A) suggest neurofibromatosis. Goiter (C) is more related to thyroid dysfunction. Hepatomegaly (D) and acanthosis (E) are more commonly seen in metabolic syndrome or insulin resistance.

—

When a competent patient declines dialysis, the next step is to support shared decision-making and explore options that align with their lifestyle. Peritoneal dialysis may allow more flexibility and autonomy compared to hemodialysis, making it more acceptable to patients with demanding schedules.

Toronto Notes 2023 – Nephrology, Chronic Kidney Disease Section:

“Peritoneal dialysis offers the advantage of home-based treatment and flexible scheduling. Patient education and peer support can improve acceptance and adherence to dialysis initiation.”

MCCQE1 Objectives – Internal Medicine > Nephrology:

“The candidate should explore treatment alternatives collaboratively, emphasizing patient autonomy, while addressing misconceptions and lifestyle concerns related to dialysis.”

Simply warning the patient or withdrawing engagement (Options B and C) may undermine rapport. Access to medical records (D) is a right, but does not actively address treatment planning. Exploring new employment (E) is inappropriate at this stage.

====================================================

The presentation is consistent with cervical spondylosis — a degenerative condition. In the absence of neurologic findings, further imaging beyond plain radiography is not warranted. Management includes conservative measures such as physiotherapy and analgesia.

Toronto Notes 2023 – Rheumatology, Cervical Spondylosis:

“Patients with typical cervical spondylosis and no red flags (e.g., neurologic deficits) do not require MRI. Treatment is conservative. Radiographs showing disc space narrowing and osteophytes confirm diagnosis.”

MCCQE1 Objectives – Internal Medicine > Musculoskeletal Disorders:

“Candidates must recognize typical degenerative spine disorders and avoid unnecessary investigations when clinical findings are straightforward.”

MRI (B) is useful if myelopathy or radiculopathy is suspected. CT (A), EMG (C), and LP (D) are not indicated here.

====================================================

The symptoms described — haloes at night, monocular diplopia, and improved near vision (second sight) — are classic signs of nuclear sclerosis-type cataracts. On exam, the most consistent finding would be an altered red reflex due to lens opacification.

Toronto Notes 2023 – Ophthalmology, Cataracts:

“Cataracts can cause glare, monocular diplopia, and improved near vision. A diminished or irregular red reflex is commonly seen on direct ophthalmoscopy.”

MCCQE1 Objectives – Internal Medicine > Ophthalmologic Disorders:

“The candidate must recognize symptoms and physical findings of cataracts, including changes in red reflex and visual acuity.”

Options A and B are associated with lipid deposition and Wilson’s disease, respectively. Retinal exudates (D) suggest diabetic or hypertensive retinopathy. Increased intraocular pressure (E) suggests glaucoma but is not supported by this clinical picture.

====================================================

This patient has a Stanford type B aortic dissection , involving the descending thoracic aorta distal to the left subclavian artery, with no evidence of branch vessel compromise or rupture. MCCQE objectives emphasize that uncomplicated type B dissections are managed medically , whereas type A dissections (ascending aorta) require urgent surgical repair.

The immediate priority is to reduce shear stress on the aortic wall by controlling heart rate and blood pressure . Intravenous beta-blockers such as labetalol or esmolol are first-line therapy. The goal is to reduce heart rate to approximately 60 bpm and lower systolic blood pressure to 100–120 mm Hg. This decreases the force of left ventricular contraction (dP/dt), limiting propagation of the dissection.

Endovascular or open repair is reserved for complicated cases (e.g., malperfusion, rupture, refractory pain, uncontrolled hypertension). Anticoagulation with heparin is contraindicated due to bleeding risk. Observation alone without blood pressure control is inappropriate.

Therefore, intravenous labetalol is the best next step.

The image shows classic features of “early childhood caries” (ECC), often called " baby bottle tooth decay.” This typically affects upper incisors first due to prolonged exposure to milk/formula or sugary drinks during sleep.

Toronto Notes 2023 – Pediatrics, “Dental Health” Section:

“ECC is most commonly caused by prolonged nighttime bottle feeding with milk or juice. It affects upper anterior teeth due to pooling and lack of protective salivary flow.”

MCCQE1 Objectives (Pediatrics > 78-2: Preventive Care):

“Candidates must recognize risk factors for dental caries in young children, including nighttime bottle use and sugary liquid exposure.”

Antibiotics (C) or iron (D) can stain but do not cause this pattern of decay. Vitamin D (A) causes enamel hypoplasia or delayed eruption. Fluoride deficiency (B) causes diffuse decay, not selective anterior tooth loss.

Comprehensive and Detailed Explanation:

Physicians must avoid conflicts of interest and maintain professional boundaries with patients and their families. Accepting a personal financial gift, regardless of intent, is inappropriate and unethical.

Toronto Notes 2023 – Ethics and Professionalism:

“Personal gifts of significant value from patients or families should be declined to avoid real or perceived conflicts of interest.”

MCCQE1 Objectives (ELOM > 90-3: Professionalism and Boundaries):

“Candidates must maintain ethical boundaries and refuse financial incentives that could compromise or appear to compromise clinical judgment.”

Other options (A, B, E) still involve a conflict. D is helpful, but the ethical obligation is to decline the cheque directly.

—

Respecting patient autonomy requires understanding their perspective before offering persuasion or incentives. The best next step is to explore the reason for non-compliance. This builds rapport and informs a shared decision-making process.

Toronto Notes 2023 – ELOM, Patient-Centered Communication:

“When a patient refuses recommended treatment, explore the reason behind the refusal before proceeding. Shared decision-making is crucial.”

MCCQE1 Objectives – ELOM > Communication and Consent:

“Candidates must demonstrate an ability to explore reasons for treatment refusal before counseling or modifying management.”

Options B and C may follow later. Options D and E can undermine appropriate pharmacologic care or violate ethics if not consented.

====================================================

Comprehensive and Detailed Explanation:

Pulsatile tinnitus synchronous with the pulse may be vascular in origin. The association with headaches and elevated BMI (a risk factor for idiopathic intracranial hypertension, IIH) warrants neuroimaging to assess for cerebral venous sinus thrombosis, vascular malformations, or raised intracranial pressure.

Toronto Notes 2023 – Neurology / ENT:

“Pulsatile tinnitus requires investigation for vascular causes including idiopathic intracranial hypertension. MRI or MRV is the next step.”

MCCQE1 Objectives (Neurology > 35-1: Headache and Tinnitus):

“Candidates must investigate pulsatile tinnitus with neuroimaging when vascular causes are suspected.”

Audiogram (A) is for hearing loss. EEG (C) is not useful for tinnitus. CRP (D) is irrelevant.

====================================================

Comprehensive and Detailed Explanation:

At 20 weeks’ gestation, the uterine fundus typically reaches the umbilicus. If the fundal height is lower than expected at a stated gestational age of 26 weeks, the most likely explanation—especially with no prior care—is a dating error.

Toronto Notes 2023 – Obstetrics:

“Fundal height at the umbilicus corresponds to ~20 weeks. In women lacking early prenatal care, dating errors are common causes of fundal height discrepancy.”

MCCQE1 Objectives (Obstetrics > 80-3: Routine Antenatal Care):

“Candidates must interpret fundal height and reconcile discrepancies with gestational age.”

IUGR and oligohydramnios are possible but require imaging confirmation. Bicornuate uterus may cause fundal shape anomalies but not significant dating discrepancy. A mole (D) would increase, not decrease, size.

—

This case features hallmark traits of antisocial personality disorder: disregard for social norms, criminal behavior, lack of remorse, impulsivity, and a history of conduct disorder (suggested by childhood ADHD and likely early behavioral problems).

Toronto Notes 2023 – Psychiatry, Personality Disorders:

“Antisocial personality disorder is characterized by disregard for rights of others, impulsivity, deceitfulness, lack of remorse, and criminal activity beginning in adolescence.”

MCCQE1 Objectives – Psychiatry > Personality Disorders:

“Candidates must distinguish antisocial personality disorder by a pattern of behavior that violates the rights of others, with evidence of conduct disorder before age 15.”

Other options do not explain the full behavioral pattern, especially the criminality and lack of remorse.

====================================================

This child has pancytopenia (severe thrombocytopenia, leukopenia, and anemia) plus systemic symptoms (fatigue, intermittent fever) and hepatosplenomegaly, strongly suggesting bone marrow failure/infiltration, most commonly acute lymphoblastic leukemia (ALL) in this age group. MCCQE objectives emphasize recognizing red flags for childhood malignancy: unexplained bruising/petechiae from thrombocytopenia, recurrent or persistent fever, pallor, and organomegaly due to leukemic infiltration or extramedullary hematopoiesis.

Immune thrombocytopenia typically causes isolated thrombocytopenia with otherwise normal hemoglobin and WBC count and usually no hepatosplenomegaly. Iron deficiency anemia causes microcytic anemia but does not explain profound thrombocytopenia and leukopenia. Viral illness may transiently suppress counts but is less likely to cause marked pancytopenia with significant organomegaly. Bacterial sepsis can cause thrombocytopenia but usually presents with acute toxicity and does not typically produce this pattern of sustained pancytopenia and hepatosplenomegaly.

Next steps (clinically) would include urgent peripheral smear, oncology referral, and bone marrow evaluation.

Clozapine and quetiapine are associated with significant weight gain and increased risk of type 2 diabetes. With a BMI of 32 and weight gain over the past year, screening for diabetes is appropriate and evidence-based.

Toronto Notes 2023 – Endocrinology, Diabetes & Psychiatry Sections:

“Second-generation antipsychotics such as clozapine increase the risk of metabolic syndrome and type 2 diabetes. Regular screening is recommended for patients with these risk factors.”

MCCQE1 Objectives – Internal Medicine > Endocrinology:

“Candidates should screen high-risk individuals, especially those on antipsychotics with weight gain, for diabetes using fasting glucose or HbA1c.”

While sleep apnea (C) is also possible, diabetes screening is the most appropriate and urgent next step in this patient. COPD (A) would present with respiratory symptoms. Cushing’s (B) and acromegaly (E) are less common and have other distinct features.

====================================================

This presentation is most consistent with acute rheumatic fever (ARF): a history of pharyngitis 4 weeks earlier, migratory large-joint pain/swelling (knee then elbow), subcutaneous nodules over extensor surfaces, and prolonged PR interval (a Jones minor criterion indicating cardiac involvement). MCCQE objectives emphasize that diagnosing ARF requires meeting Jones criteria plus evidence of preceding group A streptococcal (GAS) infection. Because the sore throat occurred weeks ago, a pharyngeal culture is often negative and is less useful for establishing prior GAS infection. The most appropriate test is therefore an antistreptolysin O (ASO) titre (or other streptococcal serology such as anti–DNase B), which documents a recent streptococcal immune response and supports the diagnosis. Echocardiography can assess severity of carditis/valvular disease, but it does not provide the required evidence of preceding GAS infection. Rheumatoid factor and biopsy of nodules do not address the likely ARF diagnosis.

Comprehensive and Detailed Explanation:

This patient demonstrates excellent exercise tolerance (17 METs) and no ischemic changes or exertional symptoms, which makes cardiac ischemia unlikely. However, the hypertensive response to exercise (BP > 190 systolic) indicates masked or latent hypertension. This should be managed proactively, typically starting with a thiazide.

Toronto Notes 2023 – Cardiology:

“An exaggerated hypertensive response during exercise is predictive of future hypertension. Treatment with antihypertensive agents such as thiazides may be warranted.”

MCCQE1 Objectives (Internal Medicine > 31-1: Hypertension and Risk Management):

“Candidates must identify abnormal BP responses to exercise and initiate appropriate treatment.”

Reassurance alone (A) ignores the hypertensive response. Catheterization (C) and beta-blockers (D) are unnecessary without ischemia. Advising against exercise (B) is counterproductive in a young, otherwise healthy patient.

—

This pregnancy demonstrates fetal growth restriction (FGR) with biometric measurements at or below the 10th percentile and oligohydramnios (AFI 5 cm). Most concerning is the finding of reversed end-diastolic flow (REDF) in the umbilical artery Doppler, which indicates severe placental insufficiency and significantly increased risk of fetal hypoxia, acidosis, and intrauterine demise. MCCQE objectives emphasize that abnormal umbilical artery Doppler findings—particularly absent or reversed end-diastolic flow—represent critical fetal compromise.

At 37 weeks’ gestation, the fetus is term. The risks of continued intrauterine exposure in the setting of REDF outweigh the risks of delivery. Therefore, immediate delivery is indicated. Expectant management with nonstress testing or delayed reassessment is inappropriate because REDF is associated with high perinatal mortality.

Prompt delivery (often by cesarean section depending on fetal status and cervical factors) is required to prevent stillbirth and severe neonatal morbidity.

This patient exhibits classic symptoms of a major depressive episode (MDE): anhedonia, low mood, social withdrawal, feelings of worthlessness, hypersomnia, and loss of appetite. These symptoms are persistent and pervasive beyond what is typical in grief.

Toronto Notes 2023 – Psychiatry, “Depressive Disorders” Section:

“MDE is characterized by ≥5 symptoms present nearly every day for ≥2 weeks including low mood, anhedonia, sleep/appetite disturbances, low energy, feelings of worthlessness, and suicidal ideation. It must cause significant impairment in functioning.”

MCCQE1 Objectives (Psychiatry > 79-1: Mood Disorders):

“Candidates must distinguish between grief, adjustment disorders, and major depression in patients with chronic illness and initiate appropriate management.”

Normal grief (A) may involve sadness and crying but does not involve pervasive hopelessness or worthlessness. Side effects of chemotherapy (C) and hepatic encephalopathy (E) have other specific physical signs. Brain metastasis (D) would more likely present with focal neurologic symptoms or cognitive impairment.

====================================================

Erectile dysfunction (ED) in older men is commonly vascular, medication-related, or associated with diabetes. This patient has well-controlled diabetes (HbA1c 6.4%) and a recent negative cardiac stress test , suggesting he is at low cardiovascular risk for sexual activity. MCCQE objectives emphasize cardiovascular risk stratification prior to prescribing phosphodiesterase-5 (PDE-5) inhibitors. Patients who are stable and cleared for moderate physical exertion (e.g., recent negative stress test) do not require additional cardiac testing before initiating sildenafil.

There is no indication for routine CBC, urine culture, PSA, or echocardiography in the absence of relevant symptoms or findings. PSA screening is unrelated to ED management and should follow age-appropriate shared decision-making guidelines. Echocardiography is unnecessary without cardiac symptoms or abnormal exam.

The key contraindication to sildenafil is concurrent nitrate therapy or unstable cardiovascular disease, neither of which is present. Therefore, no additional investigations are required before initiating treatment. Counseling should include discussion of medication interactions, side effects (e.g., headache, flushing), and avoidance with nitrates.

The patient is alert and capable of making his own decisions. The most ethical and respectful approach is to ensure he understands the risks and accept his choice. Holding his bed maintains continuity of care. Forcing him to stay (C) or discharging him AMA (A) is inappropriate if he intends to return.

Toronto Notes 2023 – ELOM, Consent and Autonomy:

“Capable patients have the right to refuse or leave treatment. Physicians must ensure informed decision-making and maintain therapeutic rapport.”

MCCQE1 Objectives – ELOM > Capacity and Patient Autonomy:

“Candidates must respect a capable patient’s right to leave care after informed discussion of risks and alternatives.”

Offering to enter his apartment (E) is inappropriate and unethical. Oral antibiotics (B) may not be clinically appropriate given hypotension.

====================================================

A posterior hip dislocation is an orthopedic emergency . The classic position is a shortened limb held in flexion, adduction, and internal rotation after high-energy trauma. MCCQE objectives emphasize immediate recognition and urgent management to prevent complications, especially avascular necrosis (AVN) of the femoral head and sciatic nerve injury . The key treatment is prompt closed reduction (ideally within hours) under procedural sedation or anesthesia, after appropriate analgesia and neurovascular assessment. Post-reduction priorities include confirming concentric reduction with imaging, repeating a neurovascular exam (particularly sciatic nerve function), and evaluating for associated fractures (acetabular or femoral head/neck) that may require CT and possible operative management.

Open reduction is reserved for irreducible dislocations, incarcerated fragments, or associated fractures preventing stable closed reduction. Skeletal traction is not definitive acute management. Total hip arthroplasty is not indicated as first-line in an acute traumatic dislocation in this context. Urgent closed reduction best aligns with time-sensitive limb- and joint-preserving care.

This is a classic presentation of diabetic peripheral neuropathy: bilateral distal sensory symptoms with preserved motor function and no other systemic findings. The most useful test to confirm this in a previously undiagnosed patient is HbA1c.

Toronto Notes 2023 – Endocrinology, Diabetes Complications:

“Peripheral neuropathy is a common complication of undiagnosed or poorly controlled diabetes. Confirm with HbA1c if diagnosis is not yet established.”

MCCQE1 Objectives – Internal Medicine > Endocrinology:

“Candidates should evaluate for diabetes in patients with peripheral neuropathy and screen appropriately with HbA1c.”

Folate (B) and B12 deficiency may also cause neuropathy but are less likely in the absence of nutritional risk factors. Other choices (A, D, E) are unrelated to this pattern.

====================================================

This infant has evidence of urinary outflow obstruction on ultrasound. The most common cause in male infants is posterior urethral valves. Poor urinary stream is a hallmark symptom of bladder outlet obstruction in neonates.

Toronto Notes 2023 – Pediatrics, “Pediatric Urology” Section:

“Posterior urethral valves should be suspected in male infants with recurrent UTIs, hydronephrosis, and a weak urinary stream. Diagnosis is confirmed by voiding cystourethrogram.”

MCCQE1 Objectives (Pediatrics > 78-4: Urinary Tract Abnormalities):

“Candidates must identify congenital causes of urinary obstruction. Poor stream and hydronephrosis are classic features of posterior urethral valves.”

Crying with urination (E) is nonspecific. Hematuria (B) and malodorous urine (D) are common with infections. Circumcision (A) is unrelated.

====================================================

Recruiting participants from an autism seminar introduces selection bias. This non-random selection increases the likelihood of overestimating associations due to pre-existing beliefs or exposures in that subgroup.

Toronto Notes 2023 – Epidemiology:

“Selection bias occurs when participants are not representative of the general population, as in recruitment from disease-specific support groups.”

MCCQE1 Objectives (Population Health > 65-2: Study Design and Appraisal):

“Candidates must recognize sources of bias in epidemiologic studies, including selection bias due to non-representative recruitment.”

Recall bias (D) is more of a concern in retrospective studies. Sponsorship (B) may create perception bias but is not a flaw in methodology itself. Standard error reporting (A) is normal. Not accounting for confounders (E) matters but recruitment source is more directly biasing.

====================================================

The classic description of brief, severe unilateral periorbital pain with autonomic symptoms (tearing), occurring in clusters (same time daily for weeks), is diagnostic of cluster headache.

Toronto Notes 2023 – Neurology, “Headaches”:

“Cluster headaches: severe unilateral periorbital pain, often with lacrimation, nasal congestion, occurring in clusters over weeks. More common in young males.”

MCCQE1 Objectives (Internal Medicine > 35-2: Headache Disorders):

“Candidates must distinguish among headache types based on duration, pattern, and associated symptoms.”

Migraine tends to last hours and has nausea or photophobia. Sinusitis causes dull, pressure-like pain. Tumour-related headache is progressive and worse with Valsalva. Post-concussive headache would have trauma history.

====================================================

In postmenopausal women with severe vasomotor symptoms, hormone therapy (estrogen with progesterone in women with an intact uterus) is the most effective treatment. It improves hot flashes, sleep, and mood symptoms.

Toronto Notes 2023 – Gynecology, Menopause Management:

“Combination hormone therapy is first-line for moderate to severe menopausal symptoms. Non-hormonal agents may be considered if contraindications exist.”

MCCQE1 Objectives – Gynecology > Menopause:

“Candidates must recognize the indication and benefits of hormone therapy for vasomotor symptoms in appropriate patients.”

Lifestyle changes (A) are supportive but insufficient. Primrose oil (C) lacks robust evidence. SSRIs (D) and clonidine (E) are second-line.

This presentation is classic for Zenker diverticulum , characterized by progressive dysphagia, regurgitation of undigested food, coughing, and halitosis due to food retention in a pharyngoesophageal pouch. Symptoms are chronic and episodic, often involving regurgitation hours after eating. MCCQE objectives emphasize selecting the safest and most appropriate diagnostic test. The best initial test is a barium swallow (contrast esophagram) , which clearly visualizes the posterior outpouching above the upper esophageal sphincter.

Endoscopy is not the first step because there is a risk of perforation if a large diverticulum is present. pH monitoring and PPI trials are used for gastroesophageal reflux disease, which does not explain regurgitation of undigested food and halitosis. CT chest is unnecessary for diagnosis.

Therefore, a barium swallow is the safest and most informative investigation to confirm suspected Zenker diverticulum before considering surgical or endoscopic management.

Comprehensive and Detailed Explanation:

This patient presents with the classic triad of normal pressure hydrocephalus (NPH): gait disturbance (often wide-based and magnetic), cognitive decline, and urinary incontinence. The combination, especially with the gait being most prominent, is highly suggestive.

Toronto Notes 2023 – Geriatrics / Neurology:

“NPH presents with gait disturbance, dementia, and urinary incontinence. Gait is typically broad-based and magnetic. Imaging shows ventriculomegaly without elevated pressure.”

MCCQE1 Objectives (Geriatrics > 41-1: Cognitive Disorders):

“Candidates must identify NPH and distinguish it from other dementias based on clinical triad and gait features.”

Alzheimer’s (B) primarily presents with memory loss. Parkinson’s (A) has bradykinesia and rigidity. Lewy body dementia (C) includes visual hallucinations and fluctuating cognition. FTD (E) has personality and behavioral changes.

====================================================

This 6-month-old presents with signs of systemic illness, tachypnea, hypoxia, and focal lung findings. In this age group, pneumonia can rapidly progress, and given the severity of symptoms, oral treatment is insufficient. Intravenous antibiotics are urgently indicated.

Toronto Notes 2023 – Pediatrics, Respiratory Infections in Infants:

“Infants under 6 months with signs of systemic illness, hypoxia (SpO2 < 94%), and respiratory distress should receive IV antibiotics. Delayed treatment may result in rapid clinical deterioration.”

MCCQE1 Objectives – Pediatrics > Respiratory Conditions:

“Candidates must recognize signs of serious lower respiratory tract infection in infants and initiate prompt IV antibiotic therapy when criteria for hospitalization are met.”

Oral antibiotics (C) are appropriate for mild outpatient pneumonia. Reassurance (B) and oral steroids (A) are inappropriate. IV fluids (D) may be supportive but do not address the infectious cause.

====================================================

In cases of blunt testicular trauma with inability to palpate the testicle due to hematoma, scrotal ultrasonography is the first-line investigation to assess for testicular rupture or other injury.

Toronto Notes 2023 – Urology, “Testicular Trauma”:

“Scrotal ultrasound is the investigation of choice to assess for testicular rupture, hematoma, or torsion. Early imaging is critical if testis is non-palpable or if hematoma is significant.”

MCCQE1 Objectives (Surgery > 51-2: Genitourinary Trauma):

“Candidates must investigate testicular trauma using ultrasound to rule out rupture or torsion.”

Exploration (B) is done if ultrasound confirms rupture. Observation or discharge (A, E) without imaging risks missing serious injury.

====================================================

This is a known patient with intellectual disability and behavioral concerns. The presentation of alcohol intoxication in a calm patient who inadvertently broke bottles warrants prompt, nonjudgmental clinical assessment before escalating. De-escalation and safety assessment come first.

Toronto Notes 2023 – Psychiatry, " Psychiatric Emergencies and Crisis Management " :

“In agitated or intoxicated individuals with developmental disability, a calm approach and prompt physician assessment are essential to prevent escalation and assess for medical or psychiatric needs.”

MCCQE1 Objectives (Psychiatry > Crisis and Acute Presentations > 72-2):

“Candidates must assess potentially disruptive patients with dignity and caution before involving law enforcement or security. Physician engagement is often calming.”

Police intervention (A) is premature and may escalate matters. Ignoring (B) risks safety. Asking him to leave (C) without assessment is inappropriate. Social work (E) may help, but after medical triage.

This child presents with “red flag” features for malignancy: a firm, fixed, nontender supraclavicular lymph node > 2 cm in size, with associated hepatosplenomegaly and night sweats. These features are most concerning for lymphoma.

Toronto Notes 2023 – Pediatrics, “Lymphadenopathy in Children”:

“Malignant lymphadenopathy tends to be firm, fixed, painless, and located in supraclavicular areas. Systemic signs (fever, weight loss, hepatosplenomegaly, night sweats) are concerning for lymphoma.”

MCCQE1 Objectives (Pediatrics > 78-3: Hematology/Oncology):

“Candidates should differentiate between benign and malignant lymphadenopathy and recognize features suggestive of lymphoma.”

Cat-scratch disease (B) is usually tender and associated with cat exposure. Kawasaki disease (C) presents with fever and mucocutaneous findings. Acute bacterial lymphadenitis (D) is painful, warm, and rapid in onset. Viral lymphadenopathy (E) is often bilateral, small, and tender.

====================================================

The correct next step is to communicate with the patient and disclose the error . MCCQE objectives emphasize physicians’ ethical and professional obligations regarding disclosure of adverse events and medical errors . When a clinically significant abnormal result was identified and appropriate follow-up was not arranged, this represents a potential error in care. Physicians have a duty to disclose errors that may have contributed to harm, provide an explanation, express regret, and outline next steps in management.

Withholding disclosure violates principles of honesty, transparency, and respect for patient autonomy. Blaming office staff or the radiologist deflects responsibility and does not address the ethical obligation to the patient. Forwarding the report to oncology does not fulfill the duty of disclosure. The physician should arrange a timely, compassionate conversation with the patient, explain the missed follow-up, discuss implications, and outline ongoing management. Documentation of the discussion and engagement in quality improvement processes are also appropriate subsequent steps.

A limited vocabulary (fewer than 50 words by age 2–3 years) and reduced social interaction (limited interest in peers) raise concern for autism spectrum disorder (ASD). Screening for ASD is the most appropriate next step.

Toronto Notes 2023 – Pediatrics, Development and Behaviour:

“Red flags for autism include delayed language, limited social reciprocity, and poor peer interaction. Screening should be initiated early when clinical signs are present.”

MCCQE1 Objectives – Pediatrics > Developmental Disorders:

“Candidates must identify key signs of ASD and initiate appropriate screening and early intervention.”

Multilingual households do not typically cause such delays (E is incorrect). ADHD (B) presents with attention/hyperactivity issues, not language/social delay. Reassurance (A) is inappropriate. Neurology referral (C) may follow but is not first-line.

====================================================

This presentation has “red flags” for raised intracranial pressure: headaches that are progressive, worse in the morning, and worsened by coughing/valsalva. In MCCQE objectives, these features require urgent evaluation for secondary causes (e.g., intracranial mass, hemorrhage, obstructive hydrocephalus) rather than empiric treatment for primary headache. His chronic cough and heavy smoking increase concern for an underlying malignancy with possible brain metastasis or paraneoplastic processes, further strengthening the indication for neuroimaging. Therefore, the best next step is CT head (often the fastest initial test to identify mass effect, hemorrhage, or hydrocephalus; MRI may follow depending on findings).

Treating presumed migraine with a triptan is inappropriate when secondary headache is possible and could also pose vascular risk. His blood pressure is elevated but not in a hypertensive emergency and does not explain these classic intracranial pressure features; serial BP monitoring or starting antihypertensives should not delay imaging. Temporal arteritis is less likely without temporal tenderness, jaw claudication, visual symptoms, or systemic inflammatory clues.

A tension pneumothorax occurs when air enters the pleural space and cannot escape, creating progressively rising intrathoracic pressure. MCCQE objectives emphasize rapid recognition of life-threatening causes of respiratory distress based on bedside findings. As pressure builds, the affected hemithorax compresses the lung and pushes the mediastinum to the opposite side, producing tracheal deviation away from the affected side —a classic, high-specificity sign of tension physiology (often accompanied by severe dyspnea, tachycardia, unilateral absent breath sounds, hyperresonance, distended neck veins, and hypotension from impaired venous return).

The other options do not specifically support tension pneumothorax: ecchymoses suggest trauma; bilateral wheezing suggests asthma or bronchiolitis; abdominal distension is nonspecific; inspiratory stridor indicates upper airway obstruction (e.g., croup, foreign body). Because tension pneumothorax is a clinical diagnosis, MCCQE priorities are immediate decompression (needle thoracostomy) followed by chest tube placement—without waiting for imaging if the child is unstable.

The image shows an asymmetrical light reflex (corneal light reflex not centered in both eyes), which is diagnostic of strabismus. This misalignment of the eyes must be treated early to prevent amblyopia (lazy eye).

Toronto Notes 2023 – Pediatrics, Ophthalmology:

“Strabismus presents with misaligned visual axes. The Hirschberg light reflex is off-center in the affected eye. Prompt referral is necessary to prevent amblyopia.”

MCCQE1 Objectives – Pediatrics > Vision and Developmental Disorders:

“Candidates must recognize strabismus on visual screening and refer early for correction to prevent permanent vision impairment.”

Pseudostrabismus (B) can be ruled out here because the light reflex is not symmetric. Ptosis (A) involves drooping of the eyelid, which is not evident. Cataracts (D) would typically present with a leukocoria (white reflex), not misalignment.

====================================================

This child has acute viral gastroenteritis with mild dehydration. She remains alert, active, and continues to produce urine, indicating mild volume depletion. According to MCCQE objectives and pediatric guidelines, the first-line management of mild to moderate dehydration due to gastroenteritis is oral rehydration therapy (ORT) using a commercially prepared oral rehydration solution (ORS). ORS contains the appropriate balance of glucose and electrolytes to promote sodium and water absorption via the sodium-glucose cotransporter in the intestine. Antidiarrheal agents such as loperamide are contraindicated in young children due to risk of adverse effects and limited benefit. Withholding food until diarrhea resolves is unnecessary; early refeeding with an age-appropriate diet is recommended once rehydration begins. Apple juice and chicken broth do not provide the correct electrolyte composition and may worsen diarrhea due to high osmolarity. Routine lactose restriction is not indicated unless persistent symptoms suggest secondary lactose intolerance. Early ORT reduces the need for intravenous fluids and hospital admission.

This patient has a post-term pregnancy (≥42 weeks’ gestation). Post-term pregnancies are associated with increased risks including placental insufficiency, oligohydramnios, meconium aspiration, fetal macrosomia, and stillbirth. During induction and labour in post-term pregnancies, continuous electronic fetal monitoring (EFM) is recommended to assess fetal well-being and detect signs of fetal distress early.

Prostaglandin induction is not contraindicated; it is commonly used for cervical ripening when indicated, provided there are no standard contraindications (e.g., prior classical cesarean). Cesarean delivery is not routinely preferred solely due to post-term status; mode of delivery should be based on obstetric indications.

According to MCCQE objectives, candidates must recognize the risks associated with post-term pregnancy and understand appropriate intrapartum management, including fetal surveillance. Continuous EFM is recommended in higher-risk situations such as post-term gestation to optimize perinatal outcomes while still aiming for safe vaginal delivery when no contraindications exist.

Idiopathic hirsutism is the most likely diagnosis because this patient has isolated hirsutism with normal vital signs, normal BMI, and regular menstrual cycles , suggesting preserved ovulation and no clinically significant endocrine disturbance. MCCQE objectives emphasize that the most common causes of hirsutism are PCOS and idiopathic hirsutism; PCOS typically includes menstrual irregularity/oligo-ovulation and often metabolic features (overweight, insulin resistance), none of which are present here. Androgen-secreting ovarian tumors (hilar cell or Sertoli–Leydig cell tumors) usually cause rapid onset, severe hyperandrogenism and virilization (deepening voice, clitoromegaly, marked acne) and often disrupt menses—features not described. Nonclassic congenital adrenal hyperplasia can present with hirsutism, but it more commonly associates with acne, infertility, or menstrual abnormalities and requires biochemical suspicion rather than being the “most likely” with normal cycles. Therefore, idiopathic hirsutism—often due to increased peripheral androgen sensitivity or local 5-alpha reductase activity—is the best fit.

This clinical picture suggests giant cell arteritis (GCA) associated with polymyalgia rheumatica: new-onset headache in an older patient, proximal muscle pain and stiffness (shoulders and hips), systemic symptoms (weight loss), and mood changes. MCCQE objectives emphasize that GCA is a medical emergency because inflammation of the temporal and other cranial arteries can lead to irreversible vision loss due to ischemic optic neuropathy.

The most important objective of treatment is prevention of blindness , which requires prompt initiation of high-dose corticosteroids—often before confirmatory temporal artery biopsy—to reduce arterial inflammation and prevent vascular occlusion. While improving musculoskeletal pain and headache are important symptomatic goals, they are secondary to preventing permanent complications. Jaw claudication is a symptom of arterial insufficiency but not itself the primary outcome to prevent.

Early recognition and immediate corticosteroid therapy significantly reduce the risk of bilateral, permanent visual loss. Therefore, prevention of blindness is the most critical treatment objective.

Laryngomalacia is the most common cause of chronic stridor in infants. It presents with inspiratory stridor that worsens with feeding, supine positioning, or agitation. The child remains otherwise well and meets developmental milestones.

Toronto Notes 2023 – Pediatrics, Airway Disorders:

“Laryngomalacia presents with intermittent inspiratory stridor, typically beginning in the first few months of life. Diagnosis is clinical and prognosis is usually good.”

MCCQE1 Objectives – Pediatrics > Respiratory Disorders:

“Candidates must recognize the typical presentation of laryngomalacia and differentiate it from other causes of pediatric stridor.”

Vascular ring (A) or subglottic hemangioma (C) often present with more severe or progressive symptoms. Foreign body aspiration (D) presents acutely. TE fistula (E) usually causes feeding difficulties from birth.

Comprehensive and Detailed Explanation:

An estimated fetal weight below the 5th percentile at 30 weeks is concerning for intrauterine growth restriction (IUGR). This warrants prompt evaluation of fetal well-being via biophysical profile and Doppler assessment. The patient should be referred for further fetal assessment immediately to rule out placental insufficiency or other complications.

Toronto Notes 2023 – Obstetrics, “Fetal Growth Restriction”:

“EFW < 10th percentile, especially < 5th, warrants further evaluation including Doppler studies and biophysical profile. Immediate assessment is warranted to determine fetal well-being.”

MCCQE1 Objectives (Obstetrics > 80-4: Antepartum Surveillance):

“Candidates must initiate urgent assessment in cases of abnormal fetal growth to reduce perinatal morbidity.”

Delaying care (B) is inappropriate. Reassurance (A) is unsafe. ASA (D) is preventative, not corrective. Doppler (E) is important but should be coordinated through obstetrical triage.

====================================================

Amenorrhea for ≥12 consecutive months in a woman over age 45 is diagnostic of menopause and does not require laboratory confirmation in the absence of atypical features. MCCQE objectives emphasize that routine measurement of estrogen or progesterone levels is unnecessary in typical cases, as hormone levels fluctuate widely during the perimenopausal transition. This patient has mild menopausal symptoms (sleep disturbance and cognitive “fog”) without vasomotor symptoms, abnormal bleeding, or pelvic pain.

Pelvic ultrasound or endometrial biopsy is not indicated because she has no postmenopausal bleeding. SSRI therapy may be considered for significant vasomotor or mood symptoms but is not first-line for mild cognitive or sleep complaints in otherwise healthy menopausal women. Sleep apnea investigation is not suggested by the history.

Therefore, the most appropriate step is to explain that she is menopausal and provide reassurance, along with education about lifestyle strategies for sleep and cognitive symptoms, and discussion of treatment options if symptoms become bothersome.

Valproic acid is well known to cause thrombocytopenia, especially at higher serum concentrations or in patients over 60. Bruising with platelet count < 100 × 10⁹/L is a classic manifestation.

Toronto Notes 2023 – Psychiatry, Mood Disorders & Pharmacology Section:

“Valproic acid is associated with hematologic side effects including thrombocytopenia. Platelet counts should be monitored regularly.”

MCCQE1 Objectives – Psychiatry > Pharmacotherapy:

“The candidate must recognize adverse effects of mood stabilizers including hematologic complications of valproic acid.”

Other listed medications (A–D) have no common or direct link with thrombocytopenia in this context.

This child demonstrates classic features of obsessive-compulsive disorder (OCD): intrusive contamination fears (obsession) and repetitive handwashing behaviors (compulsion) performed to reduce anxiety. The symptoms are excessive, impairing school function, and persist beyond normal developmental concerns. According to MCCQE objectives, first-line treatment for mild to moderate pediatric OCD is cognitive-behavioral therapy (CBT) with exposure and response prevention (ERP). ERP involves gradual exposure to feared contaminants while preventing the compulsive handwashing response, thereby reducing anxiety through habituation and cognitive restructuring. Pharmacologic treatment with selective serotonin reuptake inhibitors (e.g., fluoxetine) is indicated for moderate to severe cases or when CBT alone is insufficient, but it is not the preferred initial intervention when psychotherapy is accessible. Risperidone is not first-line and may be considered only as augmentation in refractory cases. Changing schools or providing a teaching assistant does not address the underlying anxiety disorder. Early evidence-based intervention improves prognosis and functional outcomes in pediatric OCD.

This elderly man has classic lower urinary tract symptoms (LUTS) suggestive of benign prostatic hyperplasia (BPH) : hesitancy, straining, and incomplete emptying (obstructive symptoms). MCCQE objectives emphasize recognizing obstructive voiding symptoms in older men as most commonly due to prostatic enlargement causing bladder outlet obstruction.

First-line pharmacologic therapy for symptomatic BPH is an alpha-1 adrenergic receptor blocker (e.g., tamsulosin), which relaxes smooth muscle in the prostate and bladder neck, thereby improving urinary flow and reducing obstruction. Tamsulosin works relatively quickly and is appropriate for symptomatic relief.

Nitrofurantoin treats urinary tract infections, which are not suggested here. Fesoterodine is an antimuscarinic used for overactive bladder and could worsen urinary retention in obstructive BPH. Empagliflozin (an SGLT2 inhibitor) increases urinary glucose excretion and may worsen urinary frequency. Hydrochlorothiazide increases urine output and would not relieve obstructive symptoms.

Therefore, tamsulosin is the most appropriate medication to improve this patient’s symptoms.

The best next step is to assess whether smoke exposure is a known trigger for this patient’s asthma. MCCQE objectives emphasize patient-centred, culturally safe care and risk assessment before giving directive advice. Ceremonial tobacco burning can produce smoke exposure similar to other irritants; however, not all patients react the same way, and the clinician should first clarify the patient’s history of symptom provocation with smoke (tobacco, incense, campfire) and the severity of prior reactions. This information guides individualized prevention strategies, such as ensuring optimal controller use, carrying a reliever inhaler, positioning away from dense smoke, limiting duration of exposure, and having an action plan if symptoms develop.

Updating the chart to indicate the patient smokes is inappropriate because participation in a ceremony does not equal smoking. General counselling about tobacco health effects can be relevant but is not the immediate priority and may be culturally insensitive if it ignores the context. Advising avoidance may unnecessarily disrupt culturally important participation and should come only after assessing risk and discussing mitigation options.

This patient exhibits perfectionism, preoccupation with order and control, and reluctance to delegate — classic features of obsessive-compulsive personality disorder (OCPD). Unlike OCD, there are no intrusive thoughts or compulsions; rather, behaviors are ego-syntonic.

Toronto Notes 2023 – Psychiatry, Personality Disorders:

“OCPD is marked by perfectionism, rigidity, and preoccupation with productivity. It differs from OCD in lacking obsessions or compulsions.”

MCCQE1 Objectives – Psychiatry > Personality Disorders:

“Candidates must distinguish OCPD by traits of excessive perfectionism, control, and inflexibility, particularly when these interfere with functioning.”

Major depression (A) is marked by pervasive low mood, which is not reported. OCD (B) involves distressing obsessions and compulsions. GAD (C) is more generalized worry without the perfectionism and rigidity.

====================================================

Comprehensive and Detailed Explanation:

In a workplace medical note, physicians are responsible for commenting on the patient’s functional capacity and any required accommodations—not providing detailed medical diagnoses or test results unless consented to. The goal is to support a safe return to work with appropriate modifications.

Toronto Notes 2023 – ELOM, “Documentation and Work Notes”:

“Physicians should focus on functional abilities and restrictions, rather than detailed diagnoses or treatments, in employer communications.”

MCCQE1 Objectives (ELOM > 90-2: Confidentiality and Occupational Fitness):

“Candidates must maintain patient confidentiality and document work-related limitations and accommodations in employer letters.”

Diagnosis (B), imaging (E), and treatment plans (A) are confidential medical details. C (physiotherapist’s evaluation) is not the physician’s documentation.

—

Comprehensive and Detailed Explanation:

This is a classic presentation of polymyalgia rheumatica (PMR), characterized by pain and stiffness in the shoulders and hips in older adults. PMR is closely associated with giant cell arteritis (GCA), which presents with unilateral headache, jaw claudication, visual symptoms, and scalp tenderness. Given the risk of vision loss with GCA, it ' s critical to screen for these symptoms in all patients with suspected PMR.

Toronto Notes 2023 – Rheumatology, PMR and GCA:

“Patients with PMR should be assessed for symptoms of GCA such as headache, visual changes, and jaw claudication. GCA can result in permanent vision loss if not promptly treated.”

MCCQE1 Objectives – Internal Medicine > Rheumatology:

“Candidates must identify signs of GCA in patients with PMR and understand the need for prompt diagnosis and treatment.”

====================================================

Comprehensive and Detailed Explanation:

Bronchiectasis is characterized by recurrent localized pneumonia, chronic productive cough, and hemoptysis. A linear infiltrate that persists in the same area suggests localized airway damage—typical of bronchiectasis.

Toronto Notes 2023 – Respirology:

“Bronchiectasis presents with recurrent infections in the same location, productive cough, and hemoptysis. Chest X-ray may show linear opacities; high-resolution CT is diagnostic.”

MCCQE1 Objectives (Respiratory > 45-1: Chronic Respiratory Symptoms):

“Candidates must investigate recurrent pneumonias and consider bronchiectasis, especially if localized.”

Chronic bronchitis (A) presents bilaterally. Mitral stenosis (B) may cause hemoptysis but not localized infiltrates. TB (E) usually affects upper lobes. Infarction (C) is acute and not recurrent.

====================================================

This patient presents with fever, chills, anorexia, and right upper quadrant (RUQ) pain several weeks after hospitalization for sigmoid diverticulitis . A key complication of intra-abdominal infections such as diverticulitis is portal pylephlebitis with hepatic abscess formation , due to bacterial spread via the portal venous system. MCCQE objectives emphasize recognizing liver abscess as a delayed complication of intra-abdominal sepsis, particularly when new RUQ pain and fever develop after an initial abdominal infection.

The most appropriate initial imaging test to confirm this diagnosis is ultrasound of the abdomen , which can detect hepatic abscesses and guide further management. CT abdomen is also highly sensitive, but among the listed options, ultrasound is most appropriate.

Chest and abdominal radiographs are nonspecific. HIDA scan evaluates cystic duct obstruction in suspected acute cholecystitis, which is less likely given the recent diverticulitis and systemic features. ERCP is used for biliary obstruction or ascending cholangitis, typically associated with jaundice.

Thus, abdominal ultrasound is most likely to confirm a hepatic abscess.

Comprehensive and Detailed Explanation:

During mass casualty incidents, effective triage is essential to optimize care delivery. A trained physician is best used in triage or direct care. Triage is the foundation of disaster management.

Toronto Notes 2023 – Public Health / Disaster Medicine:

“In disaster response, trained healthcare providers should be deployed to triage and stabilize patients in emergency departments.”

MCCQE1 Objectives (Public Health > 65-1: Disaster Response):

“Candidates must understand principles of mass casualty management and assign appropriate roles during triage and care delivery.”

Media (D) and logistics (A, C) are secondary roles. Triage and direct care take priority.

====================================================

According to Canadian guidelines, women aged 50 to 74 at average risk for breast cancer should undergo routine screening mammography every 2 to 3 years. A great-aunt with breast cancer does not raise this patient ' s risk to high. Mammography is appropriate as she is now due for the next screen.

Toronto Notes 2023 – Population Health, “Screening Guidelines” Section:

“Routine mammography is recommended every 2 years for average-risk women aged 50 to 74. Family history in second-degree or more distant relatives (e.g., great-aunt) does not qualify for high-risk screening or MRI.”

MCCQE1 Objectives (Population Health > 97-5: Screening and Prevention):

“Candidates should apply Canadian screening recommendations including mammography for average-risk women ≥50 years old.”

Self-breast exams (C) are not recommended for screening. PET scan (D) and MRI (E) are reserved for high-risk populations or diagnostic clarification.

====================================================

Nonprescription opioid use during opioid agonist therapy is not uncommon. The response should be supportive and not punitive. Increasing the frequency of follow-up enhances monitoring, supports adherence, and prevents relapse.

Toronto Notes 2023 – Psychiatry, “Substance Use Disorders”:

“Patients who relapse during opioid agonist treatment benefit from closer monitoring and increased support, including more frequent follow-up and psychosocial interventions.”

MCCQE1 Objectives (Psychiatry > 71-5: Substance Use and Addiction):

“Candidates must manage relapses in opioid use by optimizing follow-up and support, not by discontinuing or reducing therapy prematurely.”

Tapering or discontinuing therapy (A, E) risks destabilizing treatment. Removing take-home doses (B) may be warranted later but not first. Cannabinoids (D) are not first-line adjuncts.

====================================================

The most appropriate response is to recommend vaccination and explain that the risk of intussusception after rotavirus vaccination is extremely low , while the benefits in preventing severe rotavirus gastroenteritis are substantial. MCCQE objectives in immunization and preventive pediatrics emphasize balancing risks and benefits using evidence-based data. Current rotavirus vaccines are associated with a very small increased risk of intussusception (on the order of a few additional cases per 100,000 vaccinated infants), but this risk is far outweighed by the prevention of hospitalizations, severe dehydration, and complications from rotavirus infection.

Option B overstates the risk as “markedly increased,” which is inaccurate and may heighten parental anxiety. Intussusception is not always easily treatable and can be serious (C). It occurs most commonly in infants under 1 year, not only in 1- to 3-year-olds (D). Rotavirus can cause significant morbidity in healthy infants, so routine vaccination is recommended (E). Clear, balanced counselling supports informed parental decision-making.

This patient presents with symptoms and signs of ulnar neuropathy—most likely at the elbow (cubital tunnel). Weakness in the intrinsic hand muscles and positive Tinel sign at the ulnar nerve are suggestive. Nerve conduction studies are the gold standard to confirm and localize the lesion.

Toronto Notes 2023 – Neurology, “Peripheral Nerve Disorders”:

“In cases of suspected mononeuropathy such as ulnar nerve compression, nerve conduction studies confirm the diagnosis and localize the lesion.”

MCCQE1 Objectives (Medicine > Neurology > 35-2):

“Candidates should identify and investigate focal mononeuropathies using nerve conduction studies to confirm the diagnosis and location.”

Splinting (A, C) may help after diagnosis. Physiotherapy (B) is adjunctive. MRI (D) is not the first-line investigation.

====================================================

This case addresses informed consent and professional integrity. MCCQE ELOM objectives emphasize that competent patients have the right to refuse recommended treatment, but they cannot demand a treatment that is medically inappropriate or contrary to the standard of care. If a proposed intervention (e.g., bypass of a strictured Crohn segment expected not to heal) is not clinically indicated and may cause harm, the physician is not ethically obligated to provide it.

The appropriate response is to decline to perform the inappropriate procedure while clearly explaining the rationale, including risks, benefits, alternatives, and likely outcomes. Shared decision-making and addressing the patient’s fears (e.g., risk of short bowel syndrome) are essential. If disagreement persists, offering a second opinion is reasonable—but transferring care solely to find someone willing to perform an inappropriate surgery is unethical.

A formal competency assessment is unnecessary unless there is evidence of impaired decision-making capacity. Performing a different surgery than agreed upon would violate consent. The physician must balance respect for autonomy with nonmaleficence and adherence to evidence-based practice.

Comprehensive and Detailed Explanation:

The combination of upper extremity hypertension and weak femoral pulses is classic for aortic coarctation. A soft systolic murmur may be present. This condition often becomes apparent during routine screening in school-aged children.

Toronto Notes 2023 – Pediatrics / Cardiology:

“Coarctation of the aorta presents with upper limb hypertension, diminished femoral pulses, and sometimes a systolic murmur. BP discrepancy is key.”

MCCQE1 Objectives (Pediatrics > 78-1: Congenital Heart Disease):

“Candidates must recognize signs of aortic coarctation, including weak lower limb pulses and systemic hypertension in children.”

VSD (A) typically presents with a louder murmur. Reflux nephropathy (B) may cause hypertension but without femoral pulse discrepancy. Renal artery thrombosis (C) is rare. Essential hypertension (D) is less likely in this age group with these findings.

—

Intraductal papilloma is the most likely diagnosis because it classically presents with spontaneous unilateral bloody or blood-tinged nipple discharge in a woman aged 30–50 years, often without a palpable mass. MCCQE objectives emphasize that the most common cause of pathologic nipple discharge (unilateral, spontaneous, from a single duct, and bloody/serous) is intraductal papilloma. These benign tumors arise within a lactiferous duct and can cause intermittent bleeding.

Ductal carcinoma in situ (DCIS) may cause nipple discharge but more often presents with mammographic microcalcifications and may have an associated mass. Mammary duct ectasia typically occurs in perimenopausal women and causes thick, greenish or multicolored discharge rather than bloody discharge. Staphylococcal infection (mastitis) presents with erythema, warmth, systemic symptoms, and purulent discharge. Paget disease involves eczematous changes of the nipple–areolar complex with underlying malignancy, not isolated bloody discharge without skin changes.

Therefore, in a 40-year-old woman with unilateral blood-tinged discharge and no palpable mass, intraductal papilloma is the most likely diagnosis and warrants further imaging and surgical evaluation.

Alpha blockers such as tamsulosin can facilitate the passage of ureteral stones, especially those between 5–10 mm. This is part of medical expulsive therapy.

Toronto Notes 2023 – Urology, Nephrolithiasis:

“Alpha blockers help relax the ureteral smooth muscle and improve stone passage in symptomatic distal ureteral stones.”

MCCQE1 Objectives – Surgery > Urologic Emergencies:

“Candidates should initiate medical expulsive therapy for ureteral stones under 10 mm with alpha blockers.”

Reassurance alone (A) is inadequate. Antibiotics (B) are not indicated without infection. IV fluids (E) do not significantly aid stone passage. Urology consult (D) is not needed unless there’s infection, intractable pain, or obstruction.

====================================================

Comprehensive and Detailed Explanation:

The most appropriate next step for a patient with intermittent palpitations and a normal ECG is Holter monitoring (or event monitoring). This can capture and correlate symptoms with cardiac rhythm.

Toronto Notes 2023 – Cardiology, “Palpitations”:

“Holter or event monitoring is indicated when the initial ECG is normal but the patient has episodic symptoms such as palpitations.”

MCCQE1 Objectives (Cardiology > 34-2: Arrhythmia):

“Candidates must use ambulatory ECG monitoring to investigate intermittent palpitations when resting ECG is unremarkable.”

Echocardiogram (A) assesses structural issues but not rhythm. β-blockers (B) should not be started without diagnosis. Stress testing (D) is for ischemia.

====================================================

Accurate dating is critical in pregnancies at high risk for preeclampsia and intrauterine growth restriction. First-trimester ultrasound is used to establish gestational age, which guides monitoring and interventions.

Toronto Notes 2023 – Obstetrics, High-Risk Pregnancy:

“In women with a history of preeclampsia, early and accurate dating allows for appropriate fetal surveillance and timely delivery.”

MCCQE1 Objectives – Obstetrics > Prenatal Care:

“Candidates should recognize the importance of accurate pregnancy dating in high-risk pregnancies.”

Prophylactic labetalol (E) is not indicated in normotensive patients. Genetic testing (A, B) is not appropriate unless additional risk factors are present. Bed rest (D) is not evidence-based for preeclampsia prevention.

====================================================

Comprehensive and Detailed Explanation:

Providing clinical advice (particularly treatment advice) without formally seeing or evaluating the patient creates a physician-patient relationship, potentially establishing a duty of care. If the advice leads to harm, you could be found liable, even if you never saw the patient directly.

Toronto Notes 2023 – Legal Medicine:

“Giving specific medical advice about diagnosis or treatment may imply a physician-patient relationship and establish duty of care.”

MCCQE1 Objectives (ELOM > 90-2: Legal Risk Management):

“Candidates must understand that liability can arise from informal consultations where medical advice is given.”

Providing advice (D) is riskier than simply hearing about a case or patient (A, C). Recommending consultation (B) does not establish duty of care. Not seeing the patient (E) does not automatically shield from liability if treatment advice was given.

—

Children with a BMI ≥85th percentile (overweight) and risk factors such as sedentary lifestyle or family history should be screened for cardiovascular risk. A fasting lipid profile is recommended starting at age 9–11 as part of universal screening per guidelines.

Toronto Notes 2023 – Pediatrics:

“Universal lipid screening is recommended for children aged 9–11 and 17–21. Children who are overweight should undergo targeted screening including fasting lipids.”

MCCQE1 Objectives (Pediatrics > 78-1: Preventive Pediatrics):

“Candidates must recognize screening indications for common pediatric risk factors, including dyslipidemia in overweight children.”

Thyroid and cortisol testing (C, D) are not indicated without symptoms. HbA1c (E) is used in children with BMI > 95% or with additional diabetes risk factors.

This child presents with bilateral red, itchy, watery eyes for 2 weeks without purulent discharge, pain, or visual changes—classic features of allergic conjunctivitis . MCCQE objectives emphasize distinguishing allergic conjunctivitis from infectious causes. Allergic conjunctivitis is characterized by pruritus (key symptom), tearing, conjunctival injection, and often a history of atopy or seasonal triggers. Vision remains normal, and there is no mucopurulent discharge (which would suggest bacterial infection) or vesicular lesions/dendritic ulcers (suggesting viral/herpetic causes).

Topical antihistamines (often combined with mast cell stabilizers) are first-line therapy and effectively reduce itching and redness by blocking histamine-mediated inflammation.

Topical antibiotics are unnecessary without bacterial features. Antivirals are reserved for suspected herpetic disease. Antifungals are rarely indicated in routine conjunctivitis. Topical glucocorticoids are not first-line and may cause adverse effects (e.g., increased intraocular pressure) and should only be used under ophthalmologic supervision.

Therefore, a topical antihistamine is the most appropriate initial treatment.

In pediatric trauma, inability to void with perineal bruising raises concern for urethral injury or urinary retention due to soft tissue swelling. The most immediate step is to attempt bladder catheterization. If unsuccessful, consult gynecology or urology urgently to avoid bladder overdistension.

Toronto Notes 2023 – Pediatrics, Genitourinary Trauma:

“In females, perineal trauma can lead to urinary retention due to labial hematomas or urethral injury. If catheterization is difficult, consult gynecology or urology for assistance.”

MCCQE1 Objectives – Pediatrics > Trauma and Emergency Care:

“Candidates must recognize when specialist consultation is required in pediatric genitourinary trauma, especially in cases of failed catheterization.”

Options B and D delay necessary care. Coagulation studies (C) may be considered if bleeding is unexplained. Abuse assessment (E) may be necessary later but does not address immediate retention.

Comprehensive and Detailed Explanation:

Patients undergoing splenectomy are at lifelong risk for overwhelming post-splenectomy infection (OPSI), particularly from encapsulated organisms. Vaccination against Streptococcus pneumoniae, Haemophilus influenzae type b, and Neisseria meningitidis is recommended at least 2 weeks prior to elective splenectomy.

Toronto Notes 2023 – Hematology / Surgery:

“Patients undergoing elective splenectomy should receive vaccines against pneumococcus, H. influenzae type b, and meningococcus at least 2 weeks before surgery.”

MCCQE1 Objectives (Hematology > 38-2: Thrombocytopenia and Splenectomy):

“Candidates must ensure vaccination prior to splenectomy to prevent postsplenectomy sepsis.”

Calcium (B) may be considered in chronic steroid users but is not the priority. Azithromycin (C) is not indicated. D is unsafe without tapering. E is only for acute bleeding or extremely low platelets.

—

This patient has been assessed as incapable of making the decision regarding dialysis. MCCQE ELOM objectives emphasize that when a patient lacks decision-making capacity, treatment decisions must be made by a legally authorized substitute decision-maker (SDM) according to provincial/territorial hierarchy. The appropriate next step is to determine whether a formal SDM has been appointed (e.g., power of attorney for personal care) or identify the legally ranked default SDM.

Although the wife may often be the default SDM, this depends on jurisdiction and whether a formal representative has been designated. It is inappropriate to automatically follow the son’s wishes, as he may not be the legal SDM. Nor should the physician impose their own recommendation without engaging the proper decision-making process. A large family meeting may be helpful later but does not replace identifying the legally authorized decision-maker.

Once identified, the SDM must make decisions based on the patient’s prior capable wishes or, if unknown, the patient’s best interests. Properly establishing the SDM ensures ethical and legal compliance in incapacity situations.

Once the patient’s confusion has resolved, he should be presumed capable unless an assessment shows otherwise. MCCQE ethics objectives prioritize patient autonomy, informed decision-making, and confidentiality . Families may request “therapeutic privilege” or nondisclosure, but this is not the default and cannot override a capable patient’s right to information needed to make decisions. The appropriate first step is to explore the patient’s preferences about receiving serious news (some patients prefer limited information or to delegate decisions). Asking the patient whether he wants to know the diagnosis respects autonomy while remaining sensitive to potential distress. Simply telling him immediately (without checking preferences) may conflict with patient-centered disclosure, and automatically complying with the family’s request violates the patient’s rights and undermines informed consent for goals-of-care planning. A palliative care consult is appropriate, but only after clarifying the patient’s understanding and wishes and beginning honest, preference-guided communication. The clinician should also support the family, explain ethical duties, and reassure them that disclosure can be done gradually and compassionately.

Dog bites from animals of unknown rabies status, especially from endemic regions and in patients with uncertain immunization status, require immediate post-exposure prophylaxis (PEP) including both rabies immunoglobulin and vaccine. The decision is urgent given the fatal nature of rabies.

Toronto Notes 2023 – Infectious Diseases, “Rabies Exposure”:

“Rabies PEP is indicated for bites from animals with unknown vaccination status or those showing abnormal behavior, particularly in endemic regions. PEP includes both vaccine and immunoglobulin.”

MCCQE1 Objectives (Public Health > 64-1: Rabies and Animal Bites):

“Candidates must recognize indications for rabies post-exposure prophylaxis.”

Ciprofloxacin (C) is not the antibiotic of choice (amoxicillin-clavulanate is preferred). Hydrogen peroxide (E) can be cytotoxic. Debridement (B) and CK (D) are not immediate priorities here.

====================================================

Low HDL is best managed with lifestyle changes such as increased aerobic physical activity, smoking cessation, and weight loss. Vigorous exercise has the strongest evidence for raising HDL levels.

Toronto Notes 2023 – Cardiology, Dyslipidemia:

“Increasing physical activity is among the most effective ways to raise HDL cholesterol. There is no consistent benefit to supplements such as garlic, nor does reducing salt or caffeine meaningfully raise HDL.”

MCCQE1 Objectives – Population Health > Cardiovascular Risk Management:

“Candidates should recommend evidence-based lifestyle interventions such as exercise to improve lipid profiles, particularly to increase HDL.”

Alcohol cessation (C) is generally beneficial for overall health but may actually lower HDL slightly. Garlic (D) and caffeine (E) are not evidence-based interventions for dyslipidemia.

Palliative radiotherapy is the treatment of choice for painful bone metastases, including those from prostate cancer. It provides localized pain relief and functional improvement.

Toronto Notes 2023 – Oncology, “Metastatic Bone Pain”:

“External beam radiotherapy is first-line treatment for localized bone pain from metastases. Relief occurs within days to weeks.”

MCCQE1 Objectives (Internal Medicine > Oncology > 52-1):

“Candidates must identify treatment options for symptom control in metastatic cancer, including palliative radiotherapy for painful bone lesions.”

Androgen deprivation therapy (B, C) treats systemic disease but doesn’t address acute pain. Opioids (D) may be used, but radiotherapy provides disease-targeted relief. Intrathecal steroids (A) are not standard for prostate metastases.

====================================================

This presentation is consistent with acute acalculous cholecystitis, often seen in critically ill or post-MI patients. If unresponsive to antibiotics, percutaneous cholecystostomy is the preferred next step in those who are poor surgical candidates.

Toronto Notes 2023 – General Surgery, “Hepatobiliary Disorders” Section:

“Acalculous cholecystitis occurs in critically ill patients and is often managed with percutaneous cholecystostomy if the patient is not a candidate for surgery.”

MCCQE1 Objectives (Surgery > 84-3: Biliary Disease):

“Candidates must be able to diagnose and manage acalculous cholecystitis. Management includes antibiotics and drainage via percutaneous cholecystostomy in unstable patients.”

Laparoscopic cholecystectomy (C) is standard but not suitable in acutely ill ICU patients. Broadening antibiotics (A) alone is insufficient after failure of initial therapy. ERCP (B) is for biliary obstruction or cholangitis. HIDA scan (E) is diagnostic, not therapeutic.

The most appropriate next step is to explore her concerns and provide counselling regarding labour and pain management options . MCCQE objectives emphasize patient-centered care, informed decision-making, and respect for autonomy while ensuring that patients receive appropriate information about risks and benefits. This patient is in active labour at term with ruptured membranes and expresses fear about vaginal delivery. The immediate priority is to assess the source of her fear (pain, complications, prior trauma, misinformation) and provide education about available analgesia options (e.g., epidural, intravenous opioids, nonpharmacologic methods) and the relative risks and benefits of cesarean versus vaginal delivery.

Automatically arranging a cesarean without discussion is inappropriate, particularly in a primary care setting without clear medical indication. Conversely, refusing cesarean outright is paternalistic and fails to address her concerns. Analgesia may be appropriate but should follow exploration of her preferences. Therefore, empathetic discussion and shared decision-making are the best initial approach.

The first step in any MAID request is to explore the patient ' s motivations, psychosocial concerns, and mental health status. The request should be taken seriously and approached with compassion. Exploring the reasons is essential to determine eligibility and to distinguish suffering from other potentially treatable issues (e.g., depression, loss of hope).

Toronto Notes 2023 – ELOM, " Medical Assistance in Dying " :

“Upon receiving a request for MAID, the physician must first explore the patient’s motivations, ensure understanding of their condition, and assess for coercion, depression, or other treatable factors.”

MCCQE1 Objectives (ELOM > Ethical Dilemmas > End-of-Life Care):

“Candidates must demonstrate understanding of the ethical and legal framework surrounding MAID and respond appropriately to requests by exploring reasons and providing necessary support and referrals.”

MAID is available to mature minors in some jurisdictions but not uniformly. Assuming the patient is ineligible or redirecting to other treatments without discussion is inappropriate.

====================================================

MCCQE ELOM objectives emphasize patient safety, appropriate delegation, and respecting professional scope of practice. If a nurse states an activity is outside their scope (or they are not authorized/competent in that setting), the physician should not pressure or coerce them to perform it. Delegation requires that the delegated act is permitted by regulation and workplace policy, that the person has the competence to perform it, and that appropriate supports/medical directives exist. Supervision alone does not make an out-of-scope act acceptable, so offering to “be present” does not address the underlying legal/professional boundary. Escalating immediately to the regulator is inappropriate without first clarifying the issue locally, and simply “refraining from asking again” fails to ensure the infant receives indicated care today.

The best immediate step is to ensure timely care by administering the immunizations yourself. Afterward, discuss the matter with the nurse to clarify clinic policy, required medical directives, training/competency, and how immunizations should be handled in this practice going forward (e.g., establishing protocols so authorized staff can provide vaccines safely).

The levonorgestrel-releasing intrauterine system (LNG-IUS) is the first-line treatment for heavy menstrual bleeding, particularly in women with risk factors for endometrial hyperplasia and contraindications to systemic hormones (e.g., morbid obesity, diabetes, OSA).

Toronto Notes 2023 – Gynecology, “Abnormal Uterine Bleeding” Section:

“The LNG-IUS is highly effective in reducing menstrual bleeding and improving hemoglobin levels. It is particularly recommended in women with obesity, chronic anovulation, or contraindications to estrogen.”

MCCQE1 Objectives (Obstetrics and Gynecology > 82-1: Abnormal Uterine Bleeding):

“Candidates must consider the LNG-IUS as a preferred non-surgical treatment for chronic heavy menstrual bleeding when endometrial pathology has been excluded.”

Oral contraceptives (C) are not first-line in morbid obesity due to increased thromboembolic risk. Cyclic medroxyprogesterone (D) is less effective than LNG-IUS. Hysterectomy (A) is definitive but should follow failure of conservative therapy.

This case suggests diversion of prescription opioids, a serious safety and regulatory concern. The physician must balance maintaining patient care with minimizing risk. Daily dispensing via a monitored pharmacy is the safest and most practical solution to prevent misuse or theft, while avoiding immediate discontinuation of the patient’s needed medication.

Toronto Notes 2023 – Chronic Pain & Substance Use:

“In cases of concern for opioid diversion, consider witnessed daily dispensing, prescription monitoring, and involving caregivers when appropriate.”

MCCQE1 Objectives (Internal Medicine > Pain Management > 56-2):

“The candidate must demonstrate understanding of strategies for safe prescribing and monitoring of controlled substances, including mitigation of diversion.”

Calling the police (A) is not the physician’s immediate duty. Providing an early refill (B) worsens risk. Tapering (C) may be appropriate later, but first the medication must be safeguarded. Increasing quantity (D) is inappropriate.

====================================================

Comprehensive and Detailed Explanation:

Postpartum psychosis is strongly associated with bipolar disorder and other mood disorders. A personal or family history of bipolar disorder significantly increases the risk. It typically presents within the first 2 weeks postpartum and is a psychiatric emergency.

Toronto Notes 2023 – Psychiatry, “Postpartum Psychiatric Disorders”:

“Risk factors for postpartum psychosis include personal or family history of bipolar disorder or postpartum psychosis.”

MCCQE1 Objectives (Psychiatry > 71-3: Mood Disorders):

“Candidates must recognize risk factors for postpartum psychiatric illness, particularly the association with bipolar spectrum disorders.”

Advanced maternal age (A), multiparity (B), and panic disorder (D) do not significantly increase the risk of postpartum psychosis.

====================================================

Her presentation at 6 weeks after a spouse’s death is most consistent with acute/normal grief : intense sadness, crying, social withdrawal, reduced appetite, and waves of distress triggered by reminders of the deceased. MCCQE objectives stress distinguishing grief from major depressive disorder by the fluctuating nature of symptoms , grief “pangs,” and the link to thoughts of the deceased. Although she expresses wishing to “join” her husband, this can occur in normal bereavement; the key clinical duty is to assess safety (suicidal intent, plan, means, past attempts, protective factors). In the absence of imminent risk or psychosis, inpatient/day-hospital admission is not the default. “Reassurance” alone is insufficient because she is significantly impaired and needs structured support. The best next step is referral for bereavement-focused support (often via social work), which can provide grief counseling, coping strategies, mobilization of supports, and monitoring, and can facilitate escalation if complicated grief or major depression emerges. Family systems therapy may help later, but immediate practical and grief-specific support plus safety assessment is the priority.

Postoperative fever on day 1–2 is commonly caused by atelectasis, particularly in patients who are immobile. It is considered a self-limited cause of early fever after surgery and often resolves with mobilization and pulmonary exercises.

Toronto Notes 2023 – Surgery, Postoperative Complications:

“The ‘5 W’s’ of postoperative fever: Wind (atelectasis), Water (UTI), Wound (infection), Walking (DVT), and Wonder drugs. Atelectasis typically occurs in the first 48 hours and is due to hypoventilation or pain-limited breathing.”

MCCQE1 Objectives – Surgery > Postoperative Management:

“Candidates must recognize timing-specific causes of postoperative fever. Atelectasis is the most likely cause within the first 48 hours.”

PE (B) can cause fever but is less likely without respiratory compromise. Wound infection (C) and bowel trauma (D) typically present later or with more specific symptoms. Septic pelvic thrombophlebitis (A) usually presents later and with more systemic signs.

====================================================

This patient has life-threatening complications of missed dialysis , including severe hyperkalemia (K⁺ 7.1 mmol/L), metabolic acidosis (HCO₃⁻ 11 mmol/L), volume overload with pulmonary edema (hypoxia, crackles, elevated JVP), and altered mental status. MCCQE objectives emphasize immediate recognition and treatment of emergent indications for dialysis (AEIOU: Acidosis, Electrolyte abnormalities, Intoxication, Overload, Uremia) . This patient meets multiple criteria—particularly refractory hyperkalemia and pulmonary edema—requiring urgent hemodialysis .

In emergencies where delay would risk death or serious harm, treatment proceeds under implied consent , even if the patient is confused and capacity is uncertain. Contacting family or psychiatry would dangerously delay life-saving care. While temporizing measures (e.g., IV calcium, insulin/glucose) may be given, definitive management is emergent dialysis. Morphine and furosemide alone are inadequate in severe renal failure with life-threatening hyperkalemia. Therefore, immediate initiation of urgent dialysis is the correct next step.

It is essential to balance medical guidelines with trauma-informed, patient-centered care. This includes offering future discussion while respecting boundaries. Acknowledging distress and offering to explore more in the future (B) preserves trust and autonomy.

Toronto Notes 2023 – ELOM and LGBTQ2S+ Health Section:

“For transgender individuals, screening decisions should be personalized. Trauma-informed care includes validating distress and deferring invasive exams when not urgent.”

MCCQE1 Objectives (ELOM > 99-2: Cultural Safety):

“Candidates must prioritize patient-centered communication and consent, particularly when distress or marginalization may influence healthcare interactions.”

Option A is coercive. Option C is documentation only and lacks engagement or exploration.

This infant was born at 32 weeks’ gestation and therefore growth must be interpreted using corrected (adjusted) age , not chronological age. At 1 month chronological age, his corrected age is approximately term (40 weeks). MCCQE pediatric objectives emphasize that preterm infants commonly shift percentiles after birth due to expected postnatal fluid changes and adaptation. A drop from the 50th to the 10th percentile in the first month—particularly in a clinically well, breastfed infant—can be normal when plotted appropriately on preterm growth charts and corrected for gestational age. There is no information suggesting feeding difficulty, malabsorption, or systemic illness. A sweat chloride test (for cystic fibrosis) or celiac serology is not indicated in a thriving 1-month-old infant. Routine formula supplementation is unnecessary without evidence of poor intake or failure to thrive. The appropriate management is reassurance, continued monitoring of growth using corrected age, and support for breastfeeding, with follow-up to ensure appropriate weight gain trajectory.

This constellation of features—hypotonia, macroglossia, brachycephaly, single palmar crease, short broad hands with clinodactyly—is classic for Down syndrome (Trisomy 21).

Toronto Notes 2023 – Pediatrics, “Genetic Syndromes”:

“Trisomy 21 features include hypotonia, upslanting palpebral fissures, epicanthic folds, flat nasal bridge, brachycephaly, macroglossia, single palmar crease, and clinodactyly.”

MCCQE1 Objectives (Pediatrics > 78-3: Congenital and Genetic Disorders):

“Candidates must recognize key dysmorphic features associated with common genetic syndromes including Trisomy 21.”

Prader-Willi and congenital hypothyroidism may have hypotonia but lack the full phenotypic pattern. Turner syndrome is seen in females with short stature and webbed neck. Fetal alcohol syndrome presents with smooth philtrum and microcephaly.

—

In Canada and other high-resource settings where safe alternatives are readily available, women living with HIV are advised to exclusively formula-feed their infants to eliminate the risk of postnatal HIV transmission through breast milk. HIV can be transmitted during pregnancy, delivery, and breastfeeding. While effective maternal combination antiretroviral therapy and neonatal prophylaxis significantly reduce perinatal transmission risk, breastfeeding still carries a residual risk because HIV is present in breast milk. Boiling expressed breast milk is not recommended as a standard preventive strategy in high-resource settings. Avoiding kissing is unnecessary, as casual contact does not transmit HIV. Breastfeeding only during the colostrum period does not eliminate transmission risk. According to MCCQE objectives, physicians must provide evidence-based counseling regarding prevention of vertical transmission, including maternal antiretroviral therapy, appropriate mode of delivery when indicated, neonatal prophylaxis, and avoidance of breastfeeding when safe formula feeding is accessible. Clear counseling supports informed decision-making and optimal neonatal outcomes.

This patient has classic features of exertional heat stroke—hyperthermia, hypotension, CNS symptoms (collapse), and hot, dry skin. A key complication of heat stroke is rhabdomyolysis, which can cause renal failure. Serum creatine kinase (CK) is the best next diagnostic step to confirm muscle breakdown.

Toronto Notes 2023 – Emergency Medicine, “Environmental Exposures”:

“In heat stroke, check for rhabdomyolysis (↑CK), renal impairment, and coagulopathy. Prompt cooling and hydration are critical.”

MCCQE1 Objectives (Internal Medicine > 59-3: Environmental and Toxic Exposures):

“Candidates must recognize heat-related illnesses and investigate for complications such as rhabdomyolysis and acute kidney injury.”

CT head (C) is not indicated unless persistent neurological symptoms. TSH (B), CRP (D), and blood cultures (E) are irrelevant to acute exertional hyperthermia.

====================================================

Comprehensive and Detailed Explanation:

The levonorgestrel-releasing intrauterine device (LNG-IUD) is generally contraindicated in current or recent breast cancer due to the progestin component, but may be considered in select patients on tamoxifen, especially if non-hormonal options are unsuitable. Consultation with the oncologist is required to evaluate risks and benefits.

Toronto Notes 2023 – Gynecology, “Contraception in Special Populations”:

“Levonorgestrel IUDs are generally avoided in patients with a history of hormone-sensitive cancers; however, decisions should be made collaboratively with oncology.”

MCCQE1 Objectives (Gynecology > 82-2: Contraception):

“Candidates must tailor contraceptive advice to patients with medical comorbidities, including cancer survivors.”

Irregular bleeding (A) is a common but not contraindicating side effect. No pre-procedure antibiotics (D) are typically needed. The IUD does not cause infertility (E). Risk of recurrence (C) is unconfirmed and must be individualized.

—

This patient’s lab results suggest impaired fasting glucose and an elevated A1c just below the threshold for diabetes. The gold standard to confirm diabetes in such intermediate cases is the 75 g oral glucose tolerance test (OGTT).

Toronto Notes 2023 – Endocrinology, “Diabetes Mellitus” Section:

“If A1c is in the 6.0–6.4% range or fasting glucose 6.1–6.9 mmol/L, a 75 g OGTT is recommended to establish the diagnosis of diabetes or confirm impaired glucose tolerance.”

MCCQE1 Objectives (Internal Medicine > 76-4: Diabetes):

“Candidates must correctly apply diabetes screening and diagnostic criteria and follow up abnormal results with appropriate confirmatory testing.”

Urine ACR (C) is useful in diagnosed diabetes, not for initial screening. TSH (A), capillary glucose testing (B), and exercise testing (E) are not indicated at this stage.

====================================================

Early identification of sensorineural hearing loss through universal newborn screening enables early intervention (e.g., cochlear implants, speech therapy), which can result in near-normal language development.

Toronto Notes 2023 – Pediatrics, Hearing Loss:

“Children diagnosed early with bilateral hearing loss and provided with appropriate intervention (e.g., amplification or implants) can achieve normal speech and language milestones.”

MCCQE1 Objectives – Pediatrics > Development & Communication Disorders:

“Candidates must understand the importance of early detection and intervention in congenital hearing loss and its impact on speech and literacy outcomes.”

Other options (A–C, E) are outdated or overly pessimistic. Current evidence supports favorable outcomes with early diagnosis and management.

The inability to gaze laterally with the right eye indicates dysfunction of the right lateral rectus muscle , which is innervated by cranial nerve VI (the abducens nerve). The primary action of the lateral rectus muscle is abduction of the eye (movement away from the midline). Damage to the abducens nerve results in an inability to abduct the affected eye, leading to horizontal diplopia that worsens when looking toward the side of the lesion.

MCCQE objectives emphasize understanding cranial nerve function and localization. The oculomotor nerve (CN III) controls most extraocular movements but not lateral rectus. Trochlear nerve (CN IV) innervates the superior oblique muscle, affecting downward and inward gaze. The optic nerve (CN II) is responsible for vision, not eye movement. The trigeminal nerve (CN V) provides facial sensation and mastication motor function.

Headache with a new sixth nerve palsy may raise concern for increased intracranial pressure or intracranial pathology, as CN VI is vulnerable due to its long intracranial course. Further evaluation is warranted.

This patient’s presentation—knee effusion with a soft tissue mass in the popliteal fossa following exertion—is classic for a Baker (popliteal) cyst , which represents distention of the gastrocnemius–semimembranosus bursa, often associated with intra-articular pathology (e.g., meniscal injury or osteoarthritis). MCCQE objectives emphasize selecting the least invasive, most appropriate imaging modality to confirm suspected cystic lesions.

Ultrasound is the best initial diagnostic test because it is noninvasive, readily available, and highly sensitive for distinguishing a cystic structure from a solid mass or vascular pathology (e.g., popliteal artery aneurysm or deep vein thrombosis). It can also assess for complications such as cyst rupture.

Arthroscopy is invasive and not required for diagnosis. Arthrocentesis evaluates joint effusion but does not confirm a popliteal cyst. Aspiration of the mass without imaging is inappropriate due to risk of vascular injury. CT is unnecessary and exposes the patient to radiation.

Therefore, ultrasound is the preferred method to confirm a Baker cyst.

In any suspected occupational exposure, the first step is a detailed occupational history to assess the nature, intensity, and duration of the exposure. This determines whether surveillance or further testing is appropriate.

Toronto Notes 2023 – Respiratory Medicine, “Occupational Lung Diseases” Section:

“When a patient presents with concerns about exposure to occupational hazards such as asbestos, detailed history is essential. Ask about job tasks, duration of exposure, use of personal protective equipment, and prior workplace assessments.”

MCCQE1 Objectives (Population Health > 97-2: Environmental and Occupational Health):

“Candidates must be able to obtain a detailed environmental and occupational history and determine the risk of exposure before ordering investigations.”

Ordering a chest radiograph (B) or PFTs (E) without confirming meaningful exposure is premature. Referral to a specialist (D) and reassurance (A) come only after the exposure risk is assessed.

====================================================

This case describes classic signs of delusional parasitosis (also known as Morgellons syndrome). However, the presence of widespread crusted lesions raises suspicion for crusted scabies, particularly in older adults. Crusted scabies may be misinterpreted as chronic dermatitis or psychocutaneous disorder. The most effective treatment is oral ivermectin.

Toronto Notes 2023 – Dermatology:

“Crusted scabies presents as widespread hyperkeratotic plaques with crusting. First-line treatment is oral ivermectin, often with topical permethrin.”

MCCQE1 Objectives (Medicine > Dermatology > 23-1):

“Candidates must recognize presentations of ectoparasitic infections, including scabies, and provide appropriate treatment.”

Permethrin (B) is for typical scabies, but crusted scabies often requires systemic ivermectin due to severity and spread.

====================================================

This presentation describes normal developmental dysfluency, which typically occurs between ages 2–5 and often worsens during times of stress or change, such as a new sibling. It is characterized by word repetition and does not require intervention unless it persists > 6 months, worsens, or causes distress.

Toronto Notes 2023 – Pediatrics, " Developmental and Behavioral Pediatrics " Section:

“Developmental stuttering is common between 2–5 years and often resolves without intervention. Reassurance is appropriate unless there are signs of persistent or severe stuttering, secondary behaviors, or parental concern.”

MCCQE1 Objectives (Pediatrics > 78-1: Development and Behavior):

“Candidates must recognize typical patterns of developmental speech dysfluency and differentiate them from pathological speech disorders. Observation and reassurance are often the appropriate initial step.”

Because the child is otherwise developing normally and the onset coincides with a known psychosocial stressor, reassurance is the most appropriate step. Formal speech or behavioral therapy is not indicated at this time.

This presentation is most consistent with amyotrophic lateral sclerosis (ALS), characterized by progressive degeneration of both upper motor neurons (UMN) and lower motor neurons (LMN). The patient has LMN signs in the upper limbs—muscle atrophy of the shoulder girdle and visible fasciculations—alongside UMN signs—hyperreflexia, ankle clonus, and a Babinski reflex. The combination of UMN and LMN findings in multiple body regions with a gradual, progressive course over months strongly supports ALS. Multiple sclerosis typically produces disseminated neurologic deficits separated in time and space and does not usually cause prominent fasciculations or progressive LMN wasting. Cerebellar degeneration causes ataxia, dysmetria, and gait instability rather than mixed UMN/LMN signs. A pontine astrocytoma would more often cause cranial nerve deficits and brainstem signs and is less likely to present as a diffuse, progressive mixed motor neuron syndrome in an older adult. Parkinson disease causes bradykinesia, rigidity, and resting tremor, not Babinski or fasciculations. MCCQE objectives emphasize recognizing mixed UMN/LMN patterns and identifying ALS as a key progressive motor neuron disorder.

Endocervical polyps are common and often benign. An ulcerated polyp may bleed but is not itself suspicious unless it shows atypical features. The appropriate management is to remove the polyp (polypectomy) and send it for histopathology to exclude malignancy.

Toronto Notes 2023 – Gynecology, Cervical Pathology:

“Endocervical polyps are removed by polypectomy and sent for histological analysis. Most are benign. Atypical or ulcerated appearance may raise concern, but biopsy is unnecessary if the entire lesion is excised.”

MCCQE1 Objectives – Gynecology > Abnormal Bleeding and Cervical Lesions:

“Candidates should recognize that cervical polyps causing intermenstrual bleeding should be removed and assessed histologically.”

Colposcopy (B) is reserved for abnormal cytology or high-risk lesions. Cryotherapy (A) is for cervical dysplasia. Punch biopsy (E) is used for lesions that are not amenable to polypectomy.

====================================================

Comprehensive and Detailed Explanation:

This patient is likely experiencing extrapyramidal symptoms (dysphagia/dystonia) due to haloperidol. Switching to an atypical antipsychotic (like quetiapine), which has a lower risk of EPS, is appropriate. Dysphagia in the context of antipsychotic use requires prompt medication review.

Toronto Notes 2023 – Psychiatry, “Antipsychotics and Extrapyramidal Effects”:

“Dysphagia can be a sign of extrapyramidal side effects. Consider switching to an atypical antipsychotic with lower EPS risk.”

MCCQE1 Objectives (Psychiatry > 71-5: Antipsychotic Adverse Effects):

“Candidates must recognize and manage EPS, including drug-induced dysphagia.”

Dantrolene (C) is for neuroleptic malignant syndrome, not isolated dysphagia. Laryngoscopy (B) may be useful later but not first-line. Reassurance (D) is unsafe. Lorazepam (E) may help in dystonia but doesn ' t address the root cause.

This presentation suggests hereditary hemochromatosis. Common features include hyperpigmentation ( " bronze diabetes " ), hepatomegaly, diabetes, fatigue, and elevated liver enzymes. Serum ferritin is a screening test for iron overload, and elevated levels support the diagnosis.

Toronto Notes 2023 – Endocrinology / Gastroenterology:

“Hemochromatosis presents with skin hyperpigmentation, hepatomegaly, diabetes, fatigue. Diagnosis begins with serum ferritin and transferrin saturation.”

MCCQE1 Objectives (Internal Medicine > Metabolic and Endocrine > 37-1):

“Candidates must investigate iron overload syndromes using ferritin and transferrin saturation.”

Cortisol (B) is for adrenal insufficiency. A1AT (C) is a liver disease cause but not typical here. Amylase (E) is for pancreatitis. A1c (A) would confirm diabetes but not the underlying cause.

====================================================

This patient is in the precontemplation stage because he does not recognize his alcohol use as a problem and has no intention to change his drinking behavior. Despite evidence of harm—heavy daily intake (1.2 L vodka/day) and current symptoms compatible with alcohol withdrawal/autonomic hyperactivity (tremor, diaphoresis, tachycardia, nausea/vomiting)—he frames his drinking as “social” and explicitly states he plans to continue. In the transtheoretical model, precontemplation describes individuals who are unaware, unwilling, or resistant to change within the foreseeable future. Contemplation would involve ambivalence and acknowledgement of a potential problem; preparation includes intention and planning to change soon; action involves active behavior change; maintenance refers to sustaining change over time. MCCQE objectives emphasize identifying readiness to change to guide counseling: in precontemplation, the clinician focuses on building rapport, providing clear, nonjudgmental feedback about risks, exploring discrepancies between goals and behavior, and using motivational interviewing to enhance insight rather than pushing immediate abstinence plans.