4.

2017 8th version TNM classification

Category	Definition
T — Primary tumor
TX	Primary tumor cannot be assessed
T0	No evidence of primary tumor
T1	Tumor <7 cm or less in greatest dimension, limited to the kidney
T1a	Tumor <4 cm or less
T1b	Tumor >4 cm but <7 cm
T2	Tumor >7 cm in greatest dimension, limited to the kidney
T2a	Tumor >7 cm but <10 cm
T2b	Tumors >10 cm, limited to the kidney
T3	Tumor extends into major veins or perinephric tissues but not into the ipsilateral adrenal gland and not beyond Gerota’s fascia
T3a	Tumor grossly extends into the renal vein or its segmental (muscle-containing) branches, or tumor invades perirenal and/or renal sinus fat (peripelvic fat), but not beyond Gerota’s fascia
T3b	Tumor grossly extends into the vena cava below diaphragm
T3c	Tumor grossly extends into the vena cava above the diaphragm or invades the wall of the vena cava
T4	Tumor invades beyond Gerota’s fascia (including contiguous extension into the ipsilateral adrenal gland)
N — Regional lymph node
Nx	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis
N1	Metastasis in regional lymph node(s)
M — Distant metastasis
M0	No distant metastasis
M1	Distant metastasis