Esmer A, Ahat E
Geburtshilfe Frauenheilkd. 1980 May;40(5):456-7. doi: 10.1055/s-2008-1037338.
The case of primary ovarian pregnancy in a 37 year old gravida 7, para 4 is reported. A plastic intra-uterine device was in-situ for three years. The primary left ovarian pregnancy which fulfilled Von Spiegelberg's criteria was removed at nine weeks gestation. The etiology of a primary ovarian pregnancy in the presence of an intra-uterine device is at present unknown.