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To the Editor: Dr Regge and colleagues¹ stated that because CT colonography is less invasive and thus more tolerable, it may increase adherence to colorectal cancer screening. However, this may not be true.

Assume that one 10-year cycle would require 2 CT colonography screenings vs 1 optical colonoscopy, 20% of CT colonography-screened patients need an optical colonoscopy after CT colonography for each 5-year cycle, and 1 half-day of work would be lost for CT colonography and 1 day lost for optical colonoscopy. In that case, total time off work would be 1.4 days for those screened with CT colonography vs 1 day with colonoscopy; those screened by CT colonography would experience 2.4 colon cleansing procedures vs 1 for optical colonoscopy. It seems unlikely that patients would adhere better to CT colonography screening. Prospective studies are required to answer this question.

In her Editorial, Dr Finlayson² suggested that CT colonography lesions . . . [Full Text of this Article]

Paul Pisarik, MD, MPH
paul-pisarik@ouhsc.edu
Department of Family Medicine
University of Oklahoma School of Community Medicine
Tulsa

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