Difficulties in the differential diagnosis of ulcerative colitis and Crohn's disease.
D001706:Biopsy; D003093:Colitis, Ulcerative / Q000175:diagnosis* / Q000473:pathology; D003424:Crohn Disease / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology; D008532:Megacolon, Toxic / Q000473:pathology