Pyloric stenosis--a report of triplet females and notes on its inheritance.

Pyloric stenosis has been reported in multiple sibs and multiple births, A case of the disease affecting triplets is reported, the second in the literature. The expression of pyloric stenosis is dependent upon the genetic influence of ancestors affected with the disease, as well as unknown environmental influences in the postnatal period. Descendants of affected females are the most likely to develop pyloric stenosis.