title: Identification of small rectal perforations.
mesh_terms: D006801:Humans; D007262:Infusions, Intravenous; D007416:Intestinal Perforation / Q000175:diagnosis*; D008751:Methylene Blue; D012002:Rectal Diseases / Q000175:diagnosis*; D012007:Rectum; D014546:Urinary Catheterization / Q000379:methods*
chemical_list: D008751:Methylene Blue