Collision Tumor: Benign Cystic Teratoma and Mucinous Cystadenoma in The Same Ovary- A Case Report

A collision tumor occurs when two adjacent but histologically different neoplasms coexist in the same organ without any mixing. The ovary is rarely affected (<1%) by collision tumors, however they have been documented in the gastrointestinal tract, lung, skin, adrenal glands, central nervous system, lymph nodes, and uterine. Here, we describe a case of a 22-year-old female patient who had both a benign teratoma and mucinous cystadenoma in the same ovary. Since both conditions have a significant impact on treatment, it is crucial to identify when both tumors coexist in the same ovary in order to make the right diagnosis.