In the female genital tract, malignant mixed mullerian tumor (MMMT) of the uterus is highly malignant neoplasm that histologically contains epithelial and nonepithelial elements. It is very rare tumor and generally has a poor prognosis. Its homologous type (carcinosarcoma) consists of carcinomatous and homologous sarcomatous components, and its heterologous type (mixed mesodermal tumor) consists of carcinomatous and heterologous sarcomatous components (striated muscle, cartilage or bone). This report presents a 69-year-old woman diagnosed as stage IV primary carcinosarcoma of the uterine corpus and treated with radiation therapy and conservative management. We report a case with the brief review of literature.