Canadian researchers say a review of more than 110,000 cases shows patients are at higher risk of getting cancer in the upper colon, compared with the lower colon, in the years following a negative colonoscopy. Dr. Robert Sandler of the University of North Carolina at Chapel Hill says the increased risk may occur because some lesions were missed during the colonoscopy, adding that upper colon polyps are flat and can be difficult to see. He says it also is difficult to completely clean the colon so the view inside the upper colon might not have been optimal.

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The Canadian Press

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