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Fig. 3C. —67-year-old man with clear cell carcinoma (arrow) of the kidney. Unenhanced (A), vascular phase (B), and nephrographic phase (C) CT scans. Measurements of Hounsfield density show avid enhancement on both vascular and nephrographic phase scans. Enhancement is 131 H on vascular phase and 123 H on nephrographic phase. Tumor-to-aorta enhancement ratio and tumor-to-kidney enhancement ratio are 0.66 and 0.54, respectively. These values have negative predictive value for papillary renal cell carcinoma of 98%, essentially excluding possibility of papillary cell type carcinoma.

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