title: Cavitating ulcers--pyoderma gangrenosum of the anal canal?
authors.forename: W F
authors.initials: WF
authors.lastname: Maule
authors.forename: C
authors.initials: C
authors.lastname: Perniciaro
authors.forename: T J
authors.initials: TJ
authors.lastname: Ortego
mesh_terms: D001004:Anus Diseases / Q000473:pathology*; D003424:Crohn Disease / Q000473:pathology*; D003937:Diagnosis, Differential; D005734:Gangrene / Q000473:pathology; D006801:Humans; D011711:Pyoderma / Q000473:pathology*; D014456:Ulcer / Q000473:pathology