Rectal ectopic pregnancy: A case report.

Rationale: Abdominal ectopic pregnancy is a very rare form of ectopic pregnancy, yet is associated with higher morbidity due to atypical clinical presentation and misdiagnosis. In this report, we present a case of abdominal ectopic pregnancy with placenta invading to the rectal wall.

Patient Concerns: A 32-year-old woman was admitted to our hospital with an increasing serum ß-hCG level after diagnostic laparoscopy for ectopic pregnancy in the provincial hospital. During the laparoscopy, no gestational sac was found. She was discharged and scheduled for a follow-up visit to assess the level of ß-hCG. One week later, her serum ß-hCG level increased from 7000 IU/l to 12000 IU/l. Transvaginal Doppler ultrasound and abdominal computed tomography (CT) angiography demonstrated a right adnexal mass adherent to the rectal wall.

Diagnosis: A rectal ectopic pregnancy is suspected.

Interventions: Laparoscopic surgery was successfully performed in our hospital to remove the products of conception.

Outcomes: Histologic examination confirmed the diagnosis of a rectal ectopic pregnancy. The patient had an uneventful recovery and was discharged the next few days.

Lessons: This case report reveals that an abdominal pregnancy is remarkably difficult to diagnose and manage. The gynecologists need to be aware of the possibility of gestational sac between the uterus and the rectum. To make early diagnosis of abdominal pregnancy, they need to combine clinical findings, imaging techniques (ultrasound, CT, MRI) and serial human chorionic gonadotropin measurements. Laparoscopic management should be considered in early abdominal pregnancy. A multidisciplinary team of gynecologists and gastrointestinal surgeons is required to deal with rectal ectopic pregnancy.