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Fig. 3A. —73-year-old woman. Supine scan is typical image of nontagged feces 6 mm or greater in transverse colon, presenting as rounded opacity with hyperdense peripheral ring and hypodense center and floating in small pool of barium in dependent part of transverse colon (thick arrow). Efficient tagging of fluid is seen in both descending (thin arrows) and ascending colon with some layering at this level (arrowheads).