Collision Tumor: A Rare Case Report of Benign Teratoma and Mucinous Cystadenoma in the Same Ovary

Collision tumor is defined as the coexistence of two adjacent, but histologically distinct tumors without histological admixture in the same tissue or organ. Collision tumors involving ovaries are extremely rare. The coexistence of a mucinous cystadenoma with a dermoid cyst is infrequently reported. However, the most common histological combination of collision tumor in the ovary is the coexistence of teratoma with mucinous tumors. Recognizing the potential for the coexistence of these two neoplasms in the same ovary is essential to be able to make a correct diagnosis. we report here a rare case report of ovary comprising mucinous cyst adenoma and mature cystic teratoma. The case was diagnosed postoperatively. It is important to correctly diagnose the component of tumour for further management and favourable prognosis.