There is minimal mitotic activity, no atypia and no desmoplasia.

有分裂象，无性及纤维组织增生。

If it is a fibromatous tumor, you need to check mitosis and cytologic atypia carefully to see if it is malignant, like fibrothecoma.Malignant fibrous tumor is very few in ovary.

如果它是纤维瘤，你该象纤维卵泡膜瘤一样，需要认真地观察核分裂和细性以判断它是否为恶性，卵巢恶性纤维性肿瘤非常见。