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Fig. 7B. —64-year-old man with collecting duct renal carcinoma. On contrast-enhanced CT scans obtained at same level as A, mass (arrowheads) shows heterogeneous enhancement with 43-H enhancement in corticomedullary phase (B) and 35-H enhancement in excretory phase (C). Attenuation value was 80 H in corticomedullary phase and 72 H in excretory phase. Perinephric change (arrows) is shown.