A 3-Week-Old Male Born to a 23-Year-Old Caucasian Primigravida Develops

A 3-week-old male born to a 23-year-old Caucasian primigravida develops projectile non-bilious vomiting after every meal.  Abdominal inspection reveals prominent peristalsis in the epigastrium and an olive-sized mass is felt on deep palpation of the right upper abdomen.  The mass most likely represents:

A) Infection focus
B) Neoplastic cell proliferation
C) Smooth muscle hypertrophy
D) Pancreatic juice accumulation
E) Biliary duct distension

Correct Answer:

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