Ovarian pregnancies are rare : the vast majority of ectopic pregnancies occur in the fallopian tube; only about 0.15-3 % of ectopics occur in the ovary.
12.
The etiology of ovarian pregnancy is unknown, specifically as the usual causative factors pelvic inflammatory disease and pelvic surgery implicated in tubal ectopic pregnancy seem to be uninvolved.
13.
Ovarian pregnancies rarely go longer than 4 weeks; nevertheless, there is the possibility that the trophoblast finds further support outside the ovary and thus may affect the tube and other organs.
14.
An ovarian pregnancy is usually understood to begin when a mature egg cell is not expelled or picked up from its follicle and a sperm enters the follicle and fertilizes the egg, giving rise to an intrafollicular pregnancy.
15.
Van Tussenbroek settled the question of the existence of ovarian pregnancy with her report finding that the ovary and tube on the right side were normal, that sac upon the ovary contained an embryo, that the gestation-sac was connected via a cord, and that the sac had folds of lutein tissue.
