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Background & Aims: To assess the prevalence of flat and depressed (F&D) colorectal adenomas in the United States, we performed a prospective study of 211 American patients. Methods: Dye-assisted colonoscopy was performed in the presence of both an American and a Japanese investigator. Results: F&D lesions were found in 22.7% of patients, and these were more likely to be adenomatous than...
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