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Fig. 2A —Low-dose CT that was false-negative for ureteral stone in 43-year-old overweight patient (body mass index, 30) with intense left flank pain and hematuria. Axial low-dose CT image (120 kV, 30 mAs, pitch of 1.25, 5-mm collimation) (A) of upper abdomen shows enlargement of left kidney, dilatation of left pyelocaliceal system (asterisk), stranding of perirenal fat (arrowheads), and 6-mm calculus in pyramid (black arrow). Note also 10-mm renal stone in central aspect of right kidney (white arrow). Same findings are shown on standard-dose CT image (120 kV, 180 mAs, pitch of 1, 5-mm collimation) (B).