The pylorus is the opening between the stomach and the intestines. A pyloroplasty is a surgery to make the pylorus opening wider.

Pyloric Sphincter—Pyloroplasty
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The pylorus opens and closes to allow food to pass to the intestines. Certain conditions can make this area thicker. This can make it difficult for food to pass. The condition is called pyloric stenosis. It can cause severe symptoms, such as nausea, vomiting, and dehydration.

Pyloroplasty is done to widen the opening. It can treat this condition.