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Fig. 8. —31-year-old woman at 24 weeks' gestation who presented with right lower quadrant pain, nausea, vomiting, and elevated WBC of 24,000 µL. Coronal maximum-intensity-projection image reconstruction from a multislice coronal half-Fourier single-shot fast spin-echo acquisition (TR/TE, single shot/62; flip angle, 130°; matrix, 192 x 256; field of view, 36 cm; and slice thickness, 4 mm) shows moderate hydronephrosis of right kidney. Note perirenal fluid (arrowheads) indicative of acute obstruction although no stone was detected. Stone passed day after MRI examination was performed. F = fetal head.