An ectopic pregnancy is the implantation of a fertilized ovum outside of the endometrial cavity. Approximately 95% of ectopic pregnancies occur within the fallopian tube, but implantation can also occur on the ovary and within the cervix or abdominal cavity (Figure 10-1). As the embryo grows, rupture of the structure is inevitable. It is the leading cause of pregnancy-related deaths in the first trimester secondary to hemorrhage.