Background: Primary peritoneal pregnancy is extremely rare in the category of extrauterine pregnancy and usually has wide attachment to the peritoneal surface at the implantation site.
Case: A 37-year-old woman had severe lower abdominal pain 13 days before laparotomy for a preoperative diagnosis of extrauterine pregnancy. The conceptus was implanted on the pedicle originating from the left infundibulopelvic ligament. A fresh embryo of approximately 6 weeks' gestation was found in the conceptus.
Conclusion: Primary peritoneal pregnancy may become pedunculated, and implantation on the infundibulopelvic ligament may be involved in the formation of the pedicle. A pedunculated pregnancy may increase the risk of early termination. The reflux theory may be one of the mechanisms in this case.(Obstet Gynecol 1993;82:693-5)
From the Obstetrics and Gynecology Section, Mitsui Omuta Hospital, Fukuoka, Japan.
© 1993 The American College of Obstetricians and Gynecologists