4-week-old Male in Pediatrics — Case | Pediatric Gastroenterology | SMLE Q#11165
SMLE Question #11165
Pediatrics
Pediatric Gastroenterology
Objective: OBJ-289
Last updated: February 2026
A 4-week-old male has 1 week of progressively worsening projectile, nonbilious vomiting after feeds. He is immediately hungry after vomiting, has poor weight gain, and fewer wet diapers. Examination shows mild dehydration, visible upper abdominal peristaltic waves, and a small, firm, olive-like mass in the right upper quadrant. What is the most likely diagnosis?
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