What is congenital hypertrophic pyloric stenosis?
See the answer to "What is pyloric stenosis"?
In adults the pyloric muscle or valve can be closed by scarring (from ulceration) or cancer. Sometimes pyloric stenosis in infancy is not severe enough to warrant surgery and for whatever reason some of these children grow up still having problems with their pyloric function. Problems with the pyloric sphincter in adults can be managed by medication, lifestyle changes, and/or surgery.