The widened retrorectal space: some radiographic-clinical considerations.
D001466:Barium Sulfate; D003108:Colonic Diseases / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D004733:Enema; D006801:Humans; D011859:Radiography; D012002:Rectal Diseases / Q000000981:diagnostic imaging*
D001466:Barium Sulfate