| T1a | Tumor confined to kidney, small, < 4 cm |
| T1b | Tumor confined to kidney > 4 cm, < 7 cm |
| T2a | Tumor confined to kidney > 7 cm, < 10 cm |
| T2b | Tumor confined to kidney > 10 cm |
| T3a | Tumor spread to perinephric fat, renal vein or pelvicalyceal system |
| T3b | Tumor spread to cava below diaphragm |
| T3c | Tumor spread to cava above diaphragm or invades the wall of cava |
| T4 | Tumor spread outside Gerota’s fascia, or ipsilateral adrenal gland by contiguous infiltration |
| N1 | Metastasis in single lymph node |
| N2 | Metastasis in more than one lymph node |
| M1 | Distant metastasis |
