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Review Question - QID 214366

Congenital Pyloric Stenosis Introduction A congenital stenosis of the pyloric sphincter QID: 214366 (M1.OMB.1)
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QID 214366 (Type "214366" in App Search)
A 1-month-old boy is brought by his parents to the emergency department with a 2-hour history of severe vomiting. His parents say that he was born healthy and fed normally for the first few weeks of his life; however, starting a few hours ago he started vomiting after feeds with enough force that the vomit would end up on the wall. The vomit is formula colored with no streaks of blood or other colored substances. Physical exam reveals an irritable infant with visible peristaltic waves on the abdomen. Which of the following best explains this patient's symptoms?
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