Rare Coexistence of Bilateral Mucinous Cystadenoma and Benign Brenner Tumor

Introduction: Coexistence of ovarian mucinous cystadenoma with benign Brenner tumor is a rare entity. Bilateral coexistence has not been reported before. Case Presentation: A 58-year-old postmenopausal woman presented with progressive abdominal distension and pain. Imaging revealed a large multilocular cystic mass without obvious solid components in the left ovary whereas right ovary was not clearly visualized due to adhesions. Gross and microscopic examination revealed presence of mucinous cystadenoma and benign Brenner tumor in both the ovaries.Discussion: This case highlights the importance of thorough gross and microscopic evaluation of ovarian tumors to identify coexisting neoplasms. Knowledge about such coexistence is a must for pathologists as well as surgeons as it may influence treatment decisions.