An ectopic pregnancy occurs when the fertilized egg implants in tissue outside of the uterus, and the placenta and fetus begin to develop there. The most common site is within a fallopian tube; however, ectopic pregnancies can occur in the ovary, the abdomen, and the lower portion of the uterus (the cervix).
Review Date: 2/5/2008 Reviewed By: Peter Chen, MD, Department of Obstetrics & Gynecology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.