The retrorectal soft tissue space in children: normal variations and appearances in granulomatous colitis.
D000293:Adolescent; D002648:Child; D003093:Colitis, Ulcerative / Q000000981:diagnostic imaging; D003108:Colonic Diseases / Q000000981:diagnostic imaging*; D003424:Crohn Disease / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D011859:Radiography; D012007:Rectum / Q000000981:diagnostic imaging*; D012447:Sacrum