Diagnostic performance of CT colonography for the detection of colorectal polyps.
OBJECTIVE
To investigate the diagnostic value of CT colonography for the detection of colorectal polyps.


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.


CONCLUSIONS
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.
Yun
Ji-young
JY
Department of Radiology, Song-Do Hospital, Seoul, Korea. bugbearsyun@naver.com
Ro
Hee Jeong
HJ
Park
Jong Beom
JB
Choi
Jung-Bin
JB
Chung
Ji Eun
JE
Kim
Yong Jin
YJ
Suh
Won Hyuck
WH
Lee
Jong Kyun
JK
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003111:Colonic Polyps / Q000175:diagnosis*; D023881:Colonography, Computed Tomographic / Q000379:methods*; D003113:Colonoscopy / Q000379:methods; D015179:Colorectal Neoplasms / Q000175:diagnosis*; D003287:Contrast Media / Q000008:administration & dosage; D005188:False Negative Reactions; D005189:False Positive Reactions; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D007472:Iohexol / Q000031:analogs & derivatives; D008875:Middle Aged; D015588:Observer Variation; D011237:Predictive Value of Tests; D011856:Radiographic Image Enhancement / Q000379:methods; D012189:Retrospective Studies; D012680:Sensitivity and Specificity
D003287:Contrast Media; D007472:Iohexol; C038192:iopromide