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Flat Polyps of the Colon: Detection with 16-MDCT Colonography—Preliminary Results

¹ Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 388-1 Poongnap-Dong, Songpa-Gu, Seoul, South Korea, 138-040.
² Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, South Korea.

OBJECTIVE. This study evaluates the ability of contrast-enhanced, 16-MDCT colonography to display flat colonic lesions when a very narrow slice thickness (1 mm) is used.

CONCLUSION. Less than 50% of flat lesions in our population could be visualized by blinded and unblinded review. Before they could be visualized, flat lesions were 2 mm or greater in height and 7 mm or greater in diameter. Lesions with a height of 1 mm or less were not seen on CT colonography. Contrast enhancement, location on a haustral fold, and abnormal 2D and 3D morphology contributed to lesion conspicuity.

Keywords: colon • colonography • colonoscopy • CT

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