title: Double pylorus--in evolution.
abstract: Double pylorus is a rare abnormality. Over a 4-year period, we have found two cases of double pylorus in 2,500 endoscopic examinations, an incidence of 0.08%. In one patient, the development of double pylorus from a prepyloric ulcer was followed by serial endoscopies. Most cases of double pylorus are acquired from peptic ulcer disease.
mesh_terms: D004378:Duodenal Diseases / Q000209:etiology*; D005747:Gastric Fistula / Q000209:etiology*; D006801:Humans; D007412:Intestinal Fistula / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D011708:Pylorus; D013276:Stomach Ulcer / Q000150:complications*