Ureteral rhabdomyosarcoma.

Rhabdomyosarcoma is a malignant tumor well known to urologists. These tumors arise from the genitourinary system in 20% to 25% of cases, most commonly from the bladder, prostate, vagina, and paratesticular region. This is the first reported case of a rhabdomyosarcoma arising from the ureter. The radiographic findings and ureteroscopic appearance of this tumor suggested a benign fibroepithelial polyp; however, a ureteroscopic biopsy and subsequent nephroureterectomy revealed an embryonal rhabdomyosarcoma.