Invasive cancer confined to kidney cortex and/or medulla . 2 Regional by direct extension only … Direct invasion of the bladder by a ureteral tumor is classified by the depth of greatest invasion of the bladder or ureter. SUMMARY STAGE . 0 In situ: noninvasive, intraepithelial .
https://seer.cancer.gov/tools/ssm/SSM2018-URINARY-SYSTEM.pdf