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Fig. 3. —60-year-old man without symptoms who was undergoing screening examination. Spot radiograph of sigmoid colon from double-contrast barium enema examination reveals 1.2-cm flat umbilicated tumor. One edge of tumor (white arrow) is etched by barium. Note punctate central barium collection (black arrow). Excisional biopsy revealed 0.8-cm adenocarcinoma invading superficial submucosa. Eight days later, sigmoid colon was removed, and no residual tumor was identified.

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