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Risk Factors Associated With Incomplete Colonoscopy Based on the Analysis of Computed Tomographic Colonography Findings

Lee, Eun Sun, MD*; Kim, Byung Chang, MD; Hur, Bo Yun, MD; Kim, Min Ju, MD; Park, Hyun Jeong, MD*; Park, Sung Bin, MD*; Lee, Jong Beum, MD*; Sohn, Dae Kyung, MD; Han, Kyung Su, MD; Hong, Chang Won, MD

Journal of Computer Assisted Tomography: September/October 2018 - Volume 42 - Issue 5 - p 675–679
doi: 10.1097/RCT.0000000000000741
Abdominal Imaging

Objective This study aimed to identify the computed tomographic colonography (CTC) findings of incomplete colonoscopy compared with those of complete colonoscopy.

Methods The clinical data and CTC imaging data from January 2004 to December 2012 were retrospectively obtained at 2 different institutions and reviewed by the central review system. A total of 71 patients who underwent both videocolonoscopy and CTC were included in this study. The CTC findings and clinical data were evaluated for the completeness of colonoscopy.

Results In the CTC analysis, differences in total colon length, abdominal circumference, and sigmoid colon diameter were statistically significant between both groups (P < 0.05). Body mass index (BMI) and height were identified as significant clinical factors influencing the completeness of colonoscopy. In multiple logistic regression tests, only BMI and sigmoid colon diameter were independent factors (P < 0.05).

Conclusions High BMI larger diameter of sigmoid colon was associated with incomplete colonoscopy based on CTC.

From the *Department of Radiology, Chung-Ang University Hospital, Seoul; and

Center for Colorectal Cancer, National Cancer Center, Goyang, Gyeonggi-do, Korea.

Received for publication November 2, 2017; accepted December 1, 2017.

Correspondence to: Byung Chang Kim, MD, Center for Colorectal Cancer, Research Institute and Hospital, National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 10408, Republic of Korea (e-mail:

This study was supported by a grant (NCC-1610250 and NCC-1410250) from the National Cancer Center, Korea.

This study is exempted from informed consent, because it is a retrospective study and the data collection and analysis were performed without disclosing patient's identity.

The authors declare no conflict of interest.

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