Malignant mesodermal mixed tumor of the ureter.

Malignant mesodermal mixed tumor comprised of epithelial and nonepithelial components is rarely encountered in the urological field. Only 6 cases of malignant mesodermal mixed tumor of the ureter have previously been reported in the literature. We recently encountered a 7th case of malignant mesodermal mixed tumor of the ureter and describe the case in detail. The etiology of malignant mesodermal mixed tumor is also discussed.