A uterine sarcoma is a malignant tumor that arises from the smooth muscle or connective tissue of the uterus. If the lesion originates from the stroma of the uterine lining it is an endometrial stromal sarcoma, and if the uterine muscle cell is the originator the tumor is a uterine leiomyosarcoma. A lesion that also contains malignant tumor cells of epithelial origin is termed uterine carcinosarcoma . The vast majority...