Ovarian Brenner Tumor: A Report of Two Cases and Literature Review.

Brenner tumors are relatively uncommon surface epithelial tumors of the ovary, accounting for less than 2% of all ovarian tumors. They may be of benign, borderline, or malignant nature as classified by the World Health Organization. Definitive diagnosis is made by histopathological examination after surgical excision, as it does not have pathognomonic imaging features.