4-week-old Male in Pediatrics — Case | Pediatric Gastroenterology | SMLE Q#15878
SMLE Question #15878
Pediatrics
Pediatric Gastroenterology
Objective: OBJ-289
Last updated: February 2026
A 4-week-old male infant has 10 days of progressively worsening vomiting shortly after feeds. The emesis is non-bilious and projectile, and he appears hungry afterward. He has mild dehydration. Examination reveals a small, firm epigastric “olive-like” mass. Laboratory testing is pending. What is the most appropriate next step to confirm the diagnosis?
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