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Hypertrophic pyloric stenosis — ABEM Board MCQ

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ModeratePediatric emergenciesHypertrophic pyloric stenosisABEM Board

A 5-week-old boy presents as triage level 2 with progressive nonbilious projectile vomiting after feeds. He is hungry after vomiting; labs show hypochloremic metabolic alkalosis. Which of the following is the most appropriate imaging study?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: A — Abdominal ultrasound of the pylorus

Pyloric stenosis presents at 3 to 6 weeks with projectile nonbilious vomiting and hypochloremic metabolic alkalosis; ultrasound is first-line imaging.

Reference: Pediatric surgery guidance; ABEM EM Model