|
| Tumour position | Robson | TNM | CT findings |
|
| Confined within
| I | | Soft-tissue mass
enhances |
| renal capsule | | less than normal renal |
| Small (<7 cm) | | T1 | parenchyma; central |
| Large (7 cm) | | T2 | necrosis in large RCC. |
|
| II | T3a | Perinephric stranding;
|
| Spread to
perinephric fat | Perinephric collateral
vessels; |
| Soft-tissue mass in
perinephric space |
|
| Venous
thrombus | III A | | |
| Renal vein only
| | T3b | Low-attenuation
filling defect vein; |
| IVC infradiaphragmatic | | T3c | Direct continuity of
thrombus with primary mass; |
| IVC supradiaphragmatic | | T4b | Enhanced thrombus |
|
| Regional
lymph | III B | N1-N3 | Lymph nodes 1 cm in
diameter or larger |
| node metastases |
|
| Direct invasion of adjacent organs | IV A | T4a | Obliteration of normal
soft-tissues planes between tumor and adjacent organs |
|
| Distant
metastases
| | M1 | Metastases enhance with
IV contrast material;
|
| Hepatic metastases
best in arterial phase |
|