Salt-wasting 21-hydroxylase deficiency congenital adrenal hyperplasia and pyloric stenosis in two Hispanic brothers.

The differential diagnosis of vomiting and dehydration in the first month of life includes congenital adrenal hyperplasia (CAH) and pyloric stenosis (PS). Each diagnosis may mask the presence of the other, requiring careful evaluation and follow-up. We document the occurrence of CAH and PS in two Hispanic siblings.