Brenner's tumor is small, unilateral and benign. Its diagnosis can only be confirmed by the anatomomicopathological examination, that on microscopy presents nests or columns of transition epithelial cells in a fibromatous matrix. The epithelial cells present a characteristic longitudinal "coffee bean" furrow and can undergo carcinomatous transformation. We present a case of a menopausal patient with vaginal bleeding, and a palpable abdominal mass. She was submitted to surgical treatment (total hysterectomy, bilateral oophorectomy and omentectomy) with the histopathological diagnosis of Brenner's bilateral tumor, being malignant on one side and benign on the other. After surgical treatment she is now alive for three years and free of disease.
Ovary; Ovary tumor; Endometrial hyperplasia
