Robson Classification for Renal Cell Carcinoma

Stage	Description
I	Confined by renal capsule
II	Extends through the renal capsule, but confined to the Gerota fascia
IIIA	Involves the renal vein or inferior vena cava
IIIB	Involves regional lymph nodes (> 1 cm)
IIIC	IIIA and IIIB combined
IVA	Direct invasion of adjacent organs or structures (excluding ipsilateral adrenal gland)
IVB	Distant metastases

References

Sheth S, Scatarige JC, Horton KM, Corl FM, Fishman EK. Current concepts in the diagnosis and management of renal cell carcinoma: role of multidetector ct and three-dimensional CT. Radiographics. 2001 Oct;21 Spec No:S237-54.