Q:

A 6 weeks child is brought in with vomiting, constipation and decreased serum K+. What is the diagnosis?

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A 6 weeks child is brought in with vomiting, constipation and decreased serum K+. What is the diagnosis?


  1. Pyloric stenosis
  2. Duodenal atresia
  3. Hirschsprung disease
  4. Achalasia cardia
  5. Tracheo-esophageal fistula

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The key is A. Pyloric stenosis. [why not duodenal atresia? Pyloric stenosis is much more commoner than duodenal atresia; in duodenal atresia the vomitus should contain bile, which is not the case in pyloric stenosis].

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