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Fig. 3E —54-year-old man with complicated cystic lesion on right side not correctly classified with MRI or CT in receiver operating characteristic (ROC) analysis. CT scans corresponding to A-C show lesion (arrows) is mean 20 H in unenhanced scan (D) but no measurable enhancement in axial (E) or coronal (F) view of venous scan. Peripheral enhancement could not be excluded, which led to classification of level 3 (not sure) in ROC analysis and Bosniak classification of 2f. Histologic examination of surgical specimen revealed small clear cell carcinoma.