Abscess and fistula in Crohn's disease.
D000038:Abscess / Q000209:etiology* / Q000601:surgery; D003424:Crohn Disease / Q000601:surgery*; D006801:Humans; D007412:Intestinal Fistula / Q000209:etiology* / Q000601:surgery; D011183:Postoperative Complications; D012189:Retrospective Studies