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We investigated the endoscopic and histologic features of 74 nonpolypoid neoplasias of the colorectum measuring 15 mm or less in diameter. Colonoscopically, they were characterized by flat growth, being either slightly elevated with a central depression or else completely flat against the surrounding mucosa. Of the 54 lesions measuring 5 mm or less in diameter, 3(7%) were diagnosed as cancer, whereas...
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