Pyloric Stenosis

narrowing of the passage between the stomach and the small intestine (Medicine)

Pyloric stenosis (or infantile hypertrophic pyloric stenosis) is a condition that causes severe vomiting in the first few months of life. There is narrowing (stenosis) of the opening from the stomach to the intestines, due to spasm and hypertrophy of the muscle surrounding this opening (the pylorus). Males are more commonly affected than females, and there is a genetic predisposition for the disease. It is commonly associated with people of Jewish ancestry. It is uncertain whether there is a real congenital narrowing or whether there is a functional hypertrophy of the muscle which develops in the first few weeks of life.
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Pyloric stenosis refers to a narrowing of the passage between the stomach and the small intestine. [more]Pyloric stenosis - Community and Resources

Noun
1. narrowing of the pyloric sphincter that blocks the passage of food from the stomach into the duodenum
(hypernym) stenosis, stricture

Narrowing (stenosis) of the outlet of the stomach so that food cannot pass easily from it into the duodenum, resulting in feeding problems and projectile vomiting. The obstruction can be corrected by a relatively simple surgical procedure.