Pyloric and prepyloric ulcers.
D000328:Adult; D004381:Duodenal Ulcer / Q000601:surgery*; D006801:Humans; D008875:Middle Aged; D011708:Pylorus / Q000601:surgery*; D012008:Recurrence; D013276:Stomach Ulcer / Q000601:surgery*; D014629:Vagotomy, Proximal Gastric