There is a large exophytic mass arising from the upper pole of the right kidney which measures approximately 11 x 10 x 12 cm (trans x AP x CC). A smaller lesion is seen arising from the upper pole of the left kidney measures 5 x 6 x 5 cm.
On the non-contrast study the lesions are relatively isodense to renal parenchyma. Both lesions appear fairly well circumscribed. The lesions do demonstrate contrast enhancement, although the degree of enhancement is less than the adjacent normal renal parenchyma. The large lesion on the right has central hypodensity, compatible with necrosis within the tumour. There is no calcification.
There does not appear to be any tumour extension into the right or left renal veins or the IVC. There is no local invasion into adjacent viscera or muscles. There is no hydronephrosis or obstruction.
The lung bases demonstrate cystic changes which appear paraseptal in location.