Early ulcerative colitis in children and adolescents.
D000293:Adolescent; D000328:Adult; D002648:Child; D003093:Colitis, Ulcerative / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D003424:Crohn Disease / Q000000981:diagnostic imaging; D006801:Humans; D011379:Prognosis; D011859:Radiography