title: Gallstone ileus: criteria for preoperative diagnosis.
mesh_terms: D002769:Cholelithiasis / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007077:Ileal Diseases / Q000175:diagnosis* / Q000601:surgery; D007415:Intestinal Obstruction / Q000175:diagnosis* / Q000601:surgery