Malignant extraovarian endometriosis: two case reports and review of the literature.

Two cases of adenocarcinoma arising in extraovarian endometriosis 19 and 8 years following abdominal hysterectomy and bilateral salpingo-oophorectomy are described. Both patients presented with hydronephrosis. One had been on chronic estrogen therapy. The literature is reviewed in reference to frequency, tumor type, and sites of occurrence.