Table 1.

Comparison of key histologic features to the mentioned differential diagnosis

Histologic features	Fibroma with minor sex cord elements	Ovarian Fibromatosis	Brenner tumor	Adenofibroma
Spindled cells in fascicles & whorls	Present	Present	Present	Present
Collagen	Variable	Abundant	variable	variable
Normal ovarian follicles	Replaced by fibrous stroma	Preserved	absent	absent
Small nests of undifferentiated sex cord type cells	Present (<10% of tumor area)	absent	absent	absent
Edema	absent	Present	absent	absent
Epithelial nests of transitional/mucinous cells	absent	absent	Present	absent