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Fig. 3A. —61-year-old man being evaluated for possible mass seen in left kidney on sonogram at another institution. Maximum-intensity-projection (A) and average-projection (B) CT images of left kidney generated from same contrast-enhanced CT with compression show duplication of collecting system and ureters. Average-projection CT image (B) is more conventional in appearance, resulting from summation of overlapping structures, but at cost of contrast resolution between opacified collecting system and adjacent structures.