Can pyloric stenosis return?

Usually not: Hypertrophic pyloric stenosis (HPS) in a young baby is treated with an operation called a pyloromyotomy. The hypertrophic circular pyloric muscle fibers are split to open the pylorus & allow the stomach to empty. If done well & thoroughly, HPS should not return. One occasionally hears of a case of recurrent HPS, but often, when looked at closely, it was an inadequate pyloromyotomy to begin with.

Rare: With a good o peration no. If operation does not completely separate all the pylorus muscle fibers then there can be residual symptoms.

Very rare: Recurrent pyloric stenosis is extremely rare, 0.07% in one study. Some believe related to incomplete surgery of pyloric muscle I have seen it occur extremely rarely with very experienced pediatric surgeon.