| Tx |
Primary tumor cannot be assessed |
| T0 |
No evidence of primary tumor |
| T1 |
Largest tumor diameter ≤ 7cm, confined to the kidney; |
| T1a |
Largest tumor diameter ≤ 4cm, confined to the kidney; |
| T1b |
4cm < largest tumor diameter ≤ 7cm, confined to the kidney; |
| T2 |
Largest diameter > 7cm, confined to the kidney; |
| T2a |
7cm < largest tumor diameter ≤ 10cm, confined to the kidney; |
| T2b |
Largest diameter > 10cm, confined to the kidney; |
| T3 |
Tumor invades major veins or perirenal soft tissue but does not invade the ipsilateral adrenal gland and does not extend beyond Gerota's fascia; |
| T3a |
Tumor invades renal vein or its major branches, or invades renal pelvis, or perirenal and/or renal sinus fat but does not extend beyond Gerota's fascia; |
| T3b |
Tumor extends into the inferior vena cava below the diaphragm; |
| T3c |
Tumor extends into the inferior vena cava above the diaphragm or invades the wall of the inferior vena cava; |
| T4 |
Tumor has extended beyond Gerota's fascia; |
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