A highly aggressive malignant neoplasm arising from the ovary. Morphologically, it is a high grade tumor, composed of carcinomatous and sarcomatous elements. The disease is ovarian carcinosarcoma (MONDO_0003792). Also known as: MMMT of the ovary, carcinosarcoma of ovary, carcinosarcoma of the ovary, malignant mixed mesodermal Mullerian neoplasm of ovary, malignant mixed mesodermal Mullerian neoplasm of the ovary, malignant mixed mesodermal Mullerian tumor of ovary, malignant mixed mesodermal Mullerian tumor of the ovary, malignant mixed mesodermal Mullerian tumour of ovary.