Germ cell tumors are composed of a number of histologically different tumor types derived from the primitive germ cells of the embryonic gonad. Teratomas are histological subgroup of germ cell tumors, originating from primordial germ cell. Dermoid cyst or mature teratoma is the most common benign ovarian neoplasm in young and middle aged women. It accounts for approximately 20% and 50% of adult and pediatric ovarian tumors, moreover, malignant transformation occurs in 1-3% of cases. 1,2 Most common being squamous cell carcinoma. Other tumors arising in a mature cystic teratoma include adenocarcinoma, thyroid carcinoma, malignant melanoma, transitional cell carcinoma, sarcoma, carcinoid tumor, and neuroectodermaltumor. 3 The frequency of malignant change increases with increasing age rising to 19% after menopause. However,
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