Upper tract urothelial carcinomas (UTUCs) are a heterogeneous group of malignancies arising from the urothelium at the level of the renal pelvis or ureter. They comprise 5% to 10% of all urothelial carcinomas and are diagnosed in approximately two per 100,000 persons in the United States annually, the majority of whom are adults older than 70 years.1-3  A significant percentage of UTUCs are low-grade; these primarily papillary tumors are substantially less aggressive than high-grade UTUCs and demonstrate a low rate of cancer-specific mortality, but hematuria and urinary obstruction are common and require management.4-6