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Fig. 14A. —MR images of retained sponge obtained in 56-year-old man who complained of urinary frequency 5 months after radical retropubic prostatectomy. Axial spin-echo T1-weighted MR image (TR/TE, 500/15) after injection of contrast material shows that sponge is identified as low-signal structure anterior to contrast-filled bladder. Peripheral enhancement of thick-walled capsule (arrow) is noted.