Endometrioid Adenofibroma: A Case of This Uncommon Benign Tumor of the Ovary Not Associated to Borderline or Endometrioid Carcinoma

Endometrioid adenofibroma is a benign epithelial and stromal tumor with an endometrioid epithelial component. Less than 20% of the surface epithelial tumors of the ovary have endometrioid differentiation. The majority of endometrioid ovarian neoplasms are carcinomas and the benign form is rarely find. Endometrioid adenofibromas are extremely rare, comprise 1% of ovarian epithelial neoplasms. Usually, they are unilateral lesions (83%) and clinical symptoms are non-specific. Ovarian endometriosis (including endometriomas and endometriotic cysts) is by far more common than benign endometrioid neoplasms. Probably it represents endometriomas in which the endometrial stroma is indistinct.