An ectopic pregnancy is a pregnancy where the fertilized egg implants somewhere other than the uterus. Pregnancies of this type are generally not viable and are dangerous to the mother. About 1% of pregnancies are ectopic and in 98% of those cases, the egg implants in the fallopian tube. In rarer cases, the egg may implant in an ovary, the cervix, or elsewhere in the abdomen. Many ectopic pregnancies occur in perfectly healthy women, but some conditions are risk factors, such as pelvic inflammatory disease, infertility, smoking, sterilzation by tubal ligation and the use of an IUD.