[A case of Müllerian adenosarcoma of the uterus]

A case of Müllerian adenosarcoma of the uterus is reported. This is a low-grade malignant tumor situated between fibroadenomas and carcinosarcomas in the mixed mesodermal tumors. A 69-year-old woman complaining of an abdominal mass, underwent surgical resection of a tumor of the uterus. The tumor was divided into two parts, i.e. polypoid tumor in the endometrial cavity and nodular tumor in the myometrium. The 2 tumor types showed continuity. Microscopically, it was a so-called mixed tumor consisting of a glandular element of benign epithelial cells and an undifferentiated sarcoma; it was diagnosed as adenosarcoma.