核分裂

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

组织学，变具有广泛的粘液样变、囊腔形成、血管壁透明变和缺乏核裂相等特点。

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，需要认真地观察核裂和细胞异型以判断它是否为恶，卵巢恶纤维肿非常少见。