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Fig. 1. —Attenuation measurement of renal clear cell carcinoma on CT. Region of interest (ROI) is laid in lesion (different ROIs in solid and necrotic or cystic parts) to determine attenuation values of lesion (L_x). For quantitative evaluation, attenuation of solid part gives contrast enhancement of lesion. Another ROI is identified in aorta at level of origin of renal artery that supplies kidney with tumor, giving attenuation (A_x).