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Fig. 2. —84-year-old woman with palpable mass in right lower quadrant. Spot radiograph of hepatic flexure from double-contrast barium enema examination shows 1.2-cm flat lesion as barium-etched ring shadow (white arrow) with central, linear, barium-filled umbilication (black arrow). Right hemicolectomy was performed for 7.0-cm cecal adenocarcinoma (not shown). Small flat umbilicated tumor proved to be hyperplastic polyp of 0.9 cm in diameter.

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