title: [Rectal carcinoma -- water in the rectum makes ultrasonography easier].
mesh_terms: D004733:Enema; D006801:Humans; D012004:Rectal Neoplasms / Q000000981:diagnostic imaging*; D012007:Rectum / Q000000981:diagnostic imaging*; D014463:Ultrasonography; D014867:Water
chemical_list: D014867:Water