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[Case of ovarian pregnancy following insertion of a pessary].

A 26 year old woman II-para III-gravida underwent surgery to remove a ruptured tumor which was found in place of the left ovary. Pathological-anatomical examinations determined it to have been caused by an ovarian pregnancy. The patient had used an IUD for 5 months preceeding the operation and the possible relationship between IUD use and ovarian pregnancy is discussed.