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KMID : 0880420070080060484
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Korean Journal of Radiology
2007 Volume.8 No. 6 p.484 ~ p.491
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Diagnostic Performance of CT Colonography for the Detection of Colorectal Polyps
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Yun Ji-Young
Ro Hee-Jeong
Park Jong-Beom
Choi Jung-Bin
Chung Ji-Eun
Kim Yong-Jin
Suh Won-Hyuck
Lee Jong-Kyun
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Abstract
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Objective : To investigate the diagnostic value of CT colonography for the detection of colorectal polyps.
Materials and Methods : From December 2004 to December 2005, 399 patients underwent CT colonography and follow-up conventional colonoscopy. We excluded cases of advanced colorectal cancer. We retrospectively analyzed the CT colonography findings and follow-up conventional colonoscopy findings of 113 patients who had polyps more than 6 mm in diameter. Radiologists using 3D and 2D computer generated displays interpreted the CT colonography images. The colonoscopists were aware of the CT colonography findings before the procedure.
Results : CT colonography detected 132 polyps in 107 of the 113 patients and conventional colonoscopy detected 114 colorectal polyps more than 6 mm in diameter in 87 of the 113 patients. The sensitivity of CT colonography analyzed per polyp was 91% (41/45) for polyps more than 10 mm in diameter and 89% (101/114) for polyps more than 6 mm in diameter. Thirteen polyps were missed by CT colonography and were detected on follow-up conventional colonoscopy.
Conclusion : CT colonography is a sensitive diagnostic tool for the detection of colorectal polyps and adequate bowel preparation, optimal bowel distention and clinical experience are needed to reduce the rate of missing appropriate lesions.
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KEYWORD
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Colon, CT, Colon neoplasm, Computed tomography (CT) colonography, Virtual colonoscopy
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