Squamous Cell Carcinoma Arising in Mature Cystic Teratoma of the Ovary

Malignant transformation of mature germ cell teratoma is rare and has been reported sporadically. Any of the constituent tissue of a teratoma has the potential to undergo malignant transformation. Squamous cell carcinoma is the most common transformation and is derived from the metaplastic squamous epithelium of teratoma. We are reporting a case of 65 years old postmenopausal women with squamous cell carcinoma arising in mature cystic cell teratoma of the ovary.