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Large irregular, heterogeneous, mildly enhancing left renal mass centered on lower pole and anterior cortex, with the posterior cortex stretched around the lesion. The upper pole calyces are moderately dilated while the middle and lower pole calyces are distorted. Multiple internal necrotic areas are present. No calcification or haemorrhage. The left main renal vein and IVC are patent and show no tumor thrombus. No evidence of direct invasion of any adjoining structures.