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A 65-year-old male with papillary RCC. (a) Unenhanced CT image shows an exophytic right renal mass that is intermediate in attenuation measuring 40 HU. (b) Corticomedullary phase and (c) nephrographic phase images show the mass to have progressive low-level enhancement with attenuation increase to 58 HU in corticomedullary phase, and to 77 HU in nephrographic phase. RCC, renal cell carcinoma.
