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Fig. 3. —Low-dose unenhanced multidetector CT scan obtained with 4 x 2.5 mm collimation at 120 kVp and 30 mAs in 29-year-old man who was obese (body mass index, 34.4 kg/m2) with acute left flank pain. Curved multiplanar reformation including left dilated ureter from left kidney to bladder shows ureteral stone (arrow) in distal ureter.