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Review Question - QID 214465

QID 214465 (Type "214465" in App Search)
A 6-day-old newborn girl presents with non-bilious vomiting after feeding. The patient was born via normal delivery at 39 weeks. Her 28-year-old mother was consistent with her prenatal care and has no significant past medical history. Neither the mother nor the father have any family history of heritable disorders. Physical examination is only significant for abdominal distension. Her plain abdominal radiograph is shown in Figure A. Which of the following etiologies is most likely responsible for the patient’s presentation?
  • A
  • A