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The surgeon makes a cut into the pyloric muscle (stomach outlet) down to the mucosa, the inner layer of the stomach, thus releasing the restriction. No tissue is removed and the stomach lining is not opened. The pyloric muscle returns to normal size with time.
Review Date 7/1/2025
Updated by: Charles I. Schwartz, MD, FAAP, Clinical Assistant Professor of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, General Pediatrician at PennCare for Kids, Phoenixville, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. Editorial update 09/03/2025.
