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Fig. 5B —Benign cyst in 51-year-man with renal cell carcinoma and medical history of von Hippel-Lindau disease (same patient shown in Figs. 4A and 4B) classified as Bosniak category III by both reviewers. This mass turned out to be fat necrosis. Unenhanced (A) and nephrographic phase-enhanced (B) axial CT scans show low-attenuating mass with thick enhancing wall (arrowheads, B). This mass was shown to originate from kidney on other images (not shown). Central component of this mass measured 12 H on unenhanced scan and 14 H on enhanced scan. Enhancing wall measured 21 H on unenhanced scan and 40 H after enhancement. Note wall is better appreciated on enhanced scan, suggesting its enhancement.