A 6-year-old boy appears with pubic hair and enlarged testes. Labs reveal elevated testosterone and normal LH/FSH. Most likely diagnosis is:

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Question 1 of 5

A 6-year-old boy appears with pubic hair and enlarged testes. Labs reveal elevated testosterone and normal LH/FSH. Most likely diagnosis is:

Correct Answer: B

Rationale: Testicular tumor causes precocious puberty with high testosterone and normal gonadotropins, per AAP (doc p149, Q575).

Question 2 of 5

Most common cardiac abnormality in patients with Marfan syndrome is:

Correct Answer: B

Rationale: Aortic root dilation is the most common cardiac issue in Marfan syndrome, per AAP (doc p151, Q607).

Question 3 of 5

A 5-year-old girl presents with polyuria and polydipsia. Labs show blood glucose of 250 mg/dL and ketonuria. Most likely diagnosis is:

Correct Answer: B

Rationale: Type 1 diabetes fits polyuria and ketonuria, per ADA. A, C-E differ.

Question 4 of 5

A 6-month-old infant presents with wheezing and respiratory distress. Chest x-ray shows hyperinflation. Most likely diagnosis is:

Correct Answer: B

Rationale: Bronchiolitis features wheezing and hyperinflation, per AAP. A, C-E differ.

Question 5 of 5

A 2-year-old boy presents with abdominal pain and currant jelly stools. Ultrasound confirms intussusception. The next step is:

Correct Answer: C

Rationale: Barium enema reduces intussusception, per AAP. A, B, D, E are secondary.

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