title: Medical management of interstitial pregnancy with a retained IUD. A case report.
abstract: BACKGROUND
  Systemic methotrexate therapy for interstitial pregnancy has an increased failure rate as compared to other ectopic locations. No case of interstitial pregnancy with a retained intrauterine device (IUD) has been reported on before.
  
  
  METHODS
  An asymptomatic, 21-year-old woman presented with a positive pregnancy test and a retained IUD. Vaginal ultrasound revealed a left interstitial pregnancy. Diagnostic laparoscopy was followed by a single dose of methotrexate (50 mg/m2). Five days later, a marked increase in the human chorionic gonadotropin level was followed by a second course (four doses) of methotrexate, 1 mg/kg, alternating with 0.1 mg/kg of leucovorin. Concomitant Chlamydia was treated with azithromycin, and the IUD was expelled spontaneously.
  
  
  CONCLUSIONS
  Medical management of interstitial pregnancy may prevent surgery that limits future fertility, but the evidence suggests that more than one dose of methotrexate may be required.
authors.affiliation: Department of Obstetrics and Gynecology, Walter Reed Army Medical Center, Washington, DC 20307-5001, USA. j_mcbroom@yahoo.com
authors.forename: J W
authors.initials: JW
authors.lastname: McBroom
mesh_terms: D000020:Abortifacient Agents, Nonsteroidal / Q000627:therapeutic use*; D000028:Abortion, Induced; D000328:Adult; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D017963:Azithromycin / Q000627:therapeutic use; D002690:Chlamydia Infections / Q000150:complications / Q000188:drug therapy; D003937:Diagnosis, Differential; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D002955:Leucovorin / Q000627:therapeutic use; D008727:Methotrexate / Q000627:therapeutic use*; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000150:complications / Q000175:diagnosis / Q000188:drug therapy*; D014623:Vaginal Diseases / Q000150:complications / Q000188:drug therapy
chemical_list: D000020:Abortifacient Agents, Nonsteroidal; D000900:Anti-Bacterial Agents; D017963:Azithromycin; D002955:Leucovorin; D008727:Methotrexate