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KMID : 0882420080750040420
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Korean Journal of Medicine
2008 Volume.75 No. 4 p.420 ~ p.427
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Utility of CT colonography in detecting colon polyps as a colon cancer screen
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Park Yun-Jung
Han Joon-Yeol
Kim Jin-Il
Cheung Dae-Young
Park Soo-Heon
Park Shin-Ae
Cho Se-Hyun
Jung Seung-Eun
Jang Eun-Hee
Kim Ji-Hee
Koh Myoung-Beom
Kim Jae-Kwang
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Abstract
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Background/Aims: CT colonography is a rapid and safe imaging method for detecting polyps in the colon and rectum. We assessed the efficacy of CT colonography in colorectal polyp detection.
Methods: We prospectively studied 84 subjects (mean age 55.7±11.1 years; 52 men, 32 women) undergoing CT
colonography followed by colonoscopy. Based on the results of CT colonography, all polyps were classified by size (any
size, and those larger than 5, 7, and 10 mm) and were checked for location, morphology, and histological characteristics.
We determined the sensitivity and specificity of CT colonography using colonoscopy as a reference standard with a
segmental unblinding method.
Results: A total of 56 lesions were identified in 26 of 79 subjects undergoing both CT colonography and conventional colonoscopy. The sensitivities of CT colonography for polyps of any size, and larger than 5, 7, and 10 mm were 60.7%, 70.5%, 75.9%, and 81.8%, respectively. The per-subject sensitivities of CT colonography for the polyps of any size, and larger than 5, 7, and 10 mm, were 80.7%, 95.0%, 93.3%, and 90.9%, respectively. The per-subject specificities of CT colonography for polyps were 86.8%, 89.8%, 95.3%, and 100.0%, respectively. The sensitivities of CT colonography for
flat, sessile, and pedunculated polyps were 30.8%, 85.0%, and 90.0%, respectively.
Conclusions: CT colonography is a useful diagnostic method for screening colorectal neoplasias larger than 7 mm diameter, showing 75.9% sensitivity and 71.0% positive predictive value.
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KEYWORD
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Colon polyp, CT colonography, Colonoscopy
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