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CT scans of (A) clear cell renal cell carcinoma in the left upper pole of the kidney of a 78-year-old woman. (B) The CT attenuation value on the non-enhanced scan was 39 HU. (C) The enhancement value was 173 HU at 30 sec on the enhancement CT scan and (D) 96 HU at 90 sec. (E) At 5 min on the enhancement CT scan, the CT attenuation value was 72 HU. The wash-in and washout were 134 HU and 101 HU respectively. CT, computed tomography; HU, Hounsfield units.
