Attenuation and degree of enhancement of clear cell RCCs weregreater than those of papillary RCCs in the corticomedullary (thresholds 74 HU and49.6 HU), nephrographic (thresholds 72.7 Hounsfield units (HU) and 46.6 HU) phases and those of chromophobe RCCs in the corticomedullary (thresholds 105.3 HU and 66.4 HU) phase.