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Fig. 4B —51-year-man with renal cell carcinoma and medical history of von Hippel-Lindau disease classified as Bosniak category IV by both reviewers. Unenhanced (A) and corticomedullary phase enhanced (B) axial CT scans reveal large unilocular cyst originating from upper pole of left kidney. Note small mural nodule (arrow, B) in inferior wall of cyst, which measured 90 H on enhanced scan image. Nodule is not seen on unenhanced image and could not be measured. Nodular enhancement was higher on this corticomedullary phase image than on nephrographic phase image (not shown).