Endosalpingiosis in association with ovarian surface papillary tumor of borderline malignancy.

A 40-year-old woman underwent total abdominal hysterectomy, bilateral salpingo-oophorectomy, pelvic/paraaortic lymphadenectomy, and omentectomy for Stage IA ovarian surface papillary tumor of borderline malignancy. Microscopic examination revealed endosalpingiosis of ovaries, the peritoneum of uterus, pelvic lymph nodes, and omentum. There was no evidence of disseminated peritoneal malignancy. The several proposed theories of the pathogenesis of endosalpingiosis are reviewed, but that involving metaplasia of the multipotential peritoneal cells is presented as the most acceptable.