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，你应该象纤维卵泡膜瘤一样，需要认真地观察核分裂和细胞异型性以判断它是否为恶性，卵巢恶性纤维性肿瘤非常少见。