Ectopic pregnancy in the abdominal cavity is often difficult to diagnose. In this case, ultrasound will not see the fetus in the uterine cavity, no ectopic pregnancy in the bilateral adnexa, may have to use CT scan to find the fetus.

Ectopic pregnancies are cases where the fertilized egg implants somewhere other than in the uterine cavity. The most common location is in the fallopian tube, which when ruptured can easily cause many life-threatening complications.