The muscle then shrinks and heals. The operation is fairly simple and has a high success rate. Since the stenosis is usually distal to the pylorus rather than truly pyloric, such dilatation does not damage the pyloric ring, although it may on occasion lead to perforation of the first part of the duodenum. Small, frequent glucose and saline feedings are usually well tolerated several hours after the surgery. The complete relief of symptoms occurs after adequate surgical repair.
Recurrence is very unlikely.
A preweanling Flemish Giant male died suddenly, and gastric dilatation with complete closure of the pylorus was observed at postmortem examination. Histologically, the external muscularis layer of the pylorus was extremely thickened. The rabbits had similar clinical histories of anorexia, listlessness, weight loss, and constipation. Hypertrophy of the muscularis was noted in all three cases, and postmortem measurements indicate that the pylorus was thickened at the expense of the lumer as pyloric circumference was normal. It was not known if the three cases were exacerbations of congenital pyloric stenosis, whether they arose de novo in adulthood, or whether they were secondary to pylorospasm.