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Fig. 2C. —Low-dose unenhanced multidetector CT scans obtained with 4 x 2.5 mm collimation at 120 kVp in 38-year-old woman (body mass index, 23.5 kg/m²) with right acute flank pain. Axial image obtained at 60 mAs, reconstructed at same level as B was not needed by any reviewer. Calcification (arrow) corresponding to phlebolith close to right ureteropelvic junction was visible as in B.