NBME 20

nbme20/Block 3/Question#25

A 4-week-old infant is brought to the emergency ...

Hypertrophic pyloric stenosis

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submitted by hayayah(216),

Most common cause of gastric outlet obstruction in infants. Palpable olive-shaped mass in epigastric region, visible peristaltic waves, and nonbilious projectile vomiting at ∼2–6 weeks old.

Ultrasound shows thickened and lengthened pylorus. Treatment is surgical incision (pyloromyotomy).