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Fig. 7C. —20-year-old woman at 14 weeks' gestation who presented with right flank pain. Axial (B) and sagittal (C) half-Fourier single-shot fast spin-echo images (TR/TE, single shot /62; flip angle, 130°; matrix, 192 x 256; field of view, 31 cm; and slice thickness, 4 mm) obtained 4 days after sonogram show central hypointense filling defect in mid ureter (arrow, B) but no corresponding filling defect within ureter (arrow, C) at same level on sagittal image. Moderate hydronephrosis of right kidney (arrowheads, C) is seen. Multiple similar filling defects noted at different levels on axial images were believed to be flow-related artifacts. Patient's symptoms spontaneously resolved without recurrence. Stone seen on sonogram (A) is not seen on MR images. Either it passed immediately before MRI was performed or failed to visualize because of low sensitivity of MR urography for small stones.