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Review Question - QID 212387

Congenital Pyloric Stenosis Presentation Symptoms QID: 212387 (M1.OMB.18.1)
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QID 212387 (Type "212387" in App Search)
A 4-week-old boy is brought to the emergency department with a 2-day history of projectile vomiting after feeding. His parents state that he is their firstborn child and that he was born healthy. He developed normally for several weeks but started to eat less 1 week ago. Physical exam reveals a small, round mass in the right upper quadrant of the abdomen close to the midline. The infant throws up in the emergency department, and the vomitus is observed to be watery with no traces of bile. Which of the following is associated with the most likely cause of this patient's symptoms?
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