An ectopic pregnancy with implantation in the ovary is uncommon. Spiegelberg listed criteria for the diagnosis of an ovarian ectopic pregnancy in 1878.
Criteria for an ovarian ectopic pregnancy:
(1) The fallopian tube is intact and clearly separate from the ovary, including the fimbria.
(2) The gestational sac is located in the position where the ovary is normally located.
(3) The gestational sac is connected to the uterus by the utero-ovarian ligament.
(4) There is ovarian tissue in the wall of the gestational sac.
The presence of all 4 criteria is seen in the classical ovarian ectopic pregnancy. Some ectopic pregnancies that probably are involving the ovary may not meet all of the criteria.
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