Ovarian pregnancy: a report of twenty cases in one institution.

A series of 20 cases of primary ovarian pregnancy that were diagnosed and treated in one institution is reported. The prevalence rate of 1:3600 deliveries seems to be increasing in past years and comprises 3.3% of all extrauterine pregnancies. Clinical presentation, possible pathogenesis, diagnostic steps, preferred management, and future fertility are detailed. Inasmuch as all our 18 fertile patients used an intrauterine contraceptive device before the operation, special emphasis is made on the controversial relationship between use of intrauterine contraceptive devices and ovarian pregnancy.