Mitotik aktif sellüler fibrom

Ovarian fibrosarcomas and cellular fibromas are very rare tumors. Mitotic activity is reported to be the most important factor in differantial diagnosing fibrosarcoma and cellular fibroma. However, recent case reports have suggested that such tumors with a high number of mitotic figures often have favorable outcomes. An 18-year-old woman was diagnosed with ovarian tumor and underwent salpingo-oopheroctomy. Macroscopically the cut surface of the tumor showed yellowish multilobular areas. There was no sign of necrosis or hemorrhage within the tumor. Microscopically the tumor consisted of two components. One corresponded to the yellowish areas; there were more than 10 mitotic figure per 10 high-power fields but nuclear atypia was not severe in the cellular area. In the other component, there were few if any mitotic figures, there was no nuclear atypia and marked cellularity. Pathologically, the tumor was considered a mitotically active cellular fibroma. Herein, we report on a patient with a rare ovarian fibrous tumor with a large number of mitotic figures but without severe nuclear atypia. There was no recurrence after a 2-year follow-up.