Background: A collision tumor is the coexistence of two distinct tumors without any histological intermixing in the same organ or tissue. Though these types of tumors are often seen in various organs, their occurrence in the ovary is rare.
Case description: Here, we have reported a case series of three collision tumors—serous cystadenoma with mature cystic teratoma, mucinous cystadenoma with benign cystic teratoma, and a case of serous cystadenofibroma with mature cystic teratoma.
Clinical significance: It is important to identify collision tumors and also document all their components for optimal treatment.
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