Figure 8b: Small, hyperattenuating, enhancing mass in upper pole of right kidney of an 82-year-old man with bladder carcinoma. (a) Transverse unenhanced CT image shows 2.8-cm mass with attenuation of 40 HU (arrowhead). (b) Transverse CT image shows enhancement (60 HU) of the mass (arrowhead). (c) Transverse T2-weighted MR image (2500/87) shows that the mass is hypointense (arrowhead). CT-guided percutaneous fine-needle aspiration biopsy was performed. (d) Photomicrograph reveals characteristic morphologic features of papillary renal cell carcinoma. (Papanicolaou stain; original magnification, x400.)