Pathology and staging of urothelial tumors of the kidney and ureter.

Urothelial tumors of renal pelvis and ureter are rare but clinically important neoplasms. They are histologically and cytologically similar to tumors of the bladder. As in the bladder, tumor stage and grade are the most important prognostic parameters. The TNM and AJCC staging systems are described, as are criteria and other lesions that may be mistaken for urothelial tumors.