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Fig. 3A. —Series of overlapping CT scans in 63-year-old man with renal masses of each group. CT scans show enhanced attenuation of 11-mm mass (long arrow) that measured 18 H on 5-mm-thick nonoverlapping sections (A) and 11 H on 3-mm-thick overlapping sections (B). Lesion was classified as cyst on both protocols (group 1). Enhanced attenuation of 8-mm mass (arrowhead) measured 49 H on 5-mm-thick non-overlapping sections (A) and 15 H on 3-mm-thick overlapping sections (B) and was therefore classified as cyst on 3-mm-thick overlapping sections only (group 2). Enhanced attenuation of 3-mm mass (short arrow) measured 83 H on 5-mm-thick nonoverlapping sections (A) and 52 H on 3-mm-thick overlapping sections (B) and thus could not be classified as cyst on either protocol (group 3).