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Fig. 9A. —22-year-old woman at 32 weeks' gestation who presented with elevated WBC and lower abdominal pain. Findings on previously obtained sonogram and results of urine dipstick analysis were normal. Axial (A) and sagittal (B) half-Fourier single-shot fast spin-echo images (TR/TE, single shot/64; flip angle, 130°; matrix, 192 x 256; field of view, 32 cm; and slice thickness, 4 mm) show low signal intensity in nondependent portion of urinary bladder (arrows) consistent with air. Patient had not undergone instrumentation of urinary bladder and, therefore, urinary tract infection was suggested as cause. MRI findings led to performance of urine culture that documented presence of Escherichia coli.