IS RENAL SINUS FAT INVASION THE SAME AS PERINEPHRIC FAT INVASION FOR pT3a RENAL CELL CARCINOMA?

Our results indicate that clear cell tumors invading the renal sinus fat are more aggressive than tumors with perinephric fat involvement. We believe both of these features should be individually assessed during routine pathological examination. External validation is needed before suggesting a change to the TNM staging system.