title: Rectal obstruction by a giant pharmacobezoar composed of magnesium oxide: report of a case.
abstract: This report presents the rare case of a 75-year-old woman who developed a rectal obstruction caused by a pharmacobezoar, following the long-term ingestion of magnesium oxide cathartics for constipation. She was admitted to the hospital with lower abdominal pain and nausea. Abdominal computed tomography and magnetic resonance imaging showed that a huge calcified mass caused the rectal obstruction. A divided sigmoid colostomy was performed to relieve her symptoms, a colonoscopy from the distal stoma delineated a huge bezoar in the rectum, and thereafter she underwent an enterotomy. Magnesium oxide was detected in an analysis of a sample from this bezoar. Phamacobezoars resulting from laxatives or cathartics have rarely been reported. The current report showed a rectal obstruction caused by a pharmacobezoar composed primarily of magnesium oxide.
authors.affiliation: Department of Surgery, Wakayama Rosai Hospital, Wakayama, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Shigekawa
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Takashi
authors.initials: T
authors.lastname: Higashiguchi
authors.forename: Tohru
authors.initials: T
authors.lastname: Nasu
authors.forename: Motoki
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Minoru
authors.initials: M
authors.lastname: Ochiai
authors.forename: Takeshi
authors.initials: T
authors.lastname: Tsuji
authors.forename: Hiroki
authors.initials: H
authors.lastname: Yamaue
mesh_terms: D000368:Aged; D000863:Antacids / Q000009:adverse effects*; D001630:Bezoars / Q000150:complications* / Q000175:diagnosis / Q000601:surgery; D003113:Colonoscopy; D003125:Colostomy; D003937:Diagnosis, Differential; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007415:Intestinal Obstruction / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D008277:Magnesium Oxide / Q000009:adverse effects*; D008279:Magnetic Resonance Imaging; D012002:Rectal Diseases / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D012007:Rectum; D014057:Tomography, X-Ray Computed
chemical_list: D000863:Antacids; D008277:Magnesium Oxide