Histologically, the tumors were characterized by widespread myxoid, cyst formation, vessel wall hyalinization, and absence of mitoses.

组查，病变具有广泛的粘液样变、囊腔形成、血管壁透明变性和缺乏核分裂相等特点。

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，你应该象纤维卵泡膜一样，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，卵巢恶性纤维性肿非常少见。