Squamous cell carcinoma arising in a benign cystic teratoma of the ovary.

Mature cystic teratoma is the most common germ cell tumor of ovary comprising 10-20% of all ovarian tumors (1). Mature cystic teratoma is generally a benign tumor, however cases of malignant transformation occurs in 1-2% of cases (2). Preoperative diagnosis of malignant transformation is difficult because of the lack of specific symptoms and signs to suggest malignancy.The various types of malignancies which can arise from mature cystic teratoma are Squamous cell carcinoma (70-80%), adenocarcinoma, melanoma, carcinoid, soft tissue sarcomas, carcinosarcoma and glioblastoma multiforme (3-6). The prognosis of this condition is extremely poor.