[Stromal endometriosis. A rare semimalignant tumor with a tendency to recur. Clinical follow-up over 17 years].

The authors report on a female patient with stromal endometriosis. Clinical observation at the authors' clinic extended over an unusually long period, i.e., 17 years. After describing the histology, clinical symptoms, and therapeutic possibilities, the disease course, the repeated operations necessary, and the histological findings are presented in detail. In spite of the rarity of stromatosis it should be included in the differential diagnosis when diagnosing uterine sarcoma. After histological confirmation and the completion of surgical treatment of a stromatosis, recurrence and malignancy must be considered as possibilities even many years later.