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Ascending colon rotation following patient positional change during CT colonography: a potential pitfall in interpretation.
MedLine Citation:
PMID:  20711732     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
OBJECTIVE: To investigate the degree and pattern of ascending colonic rotation as patients moved from supine to prone positions during CTC.
METHODS: A search of our CTC and colonoscopy database found 37 patients (43 eligible lesions) who fulfilled the following criteria: colonoscopy-proven sessile polyps ≥6 mm in the straight mid-ascending colon, lesion visualisation in both supine and prone CTC, and optimal colonic distension. A coordinate system was developed to designate the polyp radial location (°) along the luminal circumference, unaffected by rotation of the torso. The degree/direction of polyp radial location change (i.e. ascending colonic rotation) between supine and prone positions correlated with anthropometric measurements.
RESULTS: Movement from supine to prone positions resulted in a change in the radial polyp location of between -23° and 79° (median, 21°), demonstrating external rotation of the ascending colon in almost all cases (2° to 79° in 36/37 patients and 42/43 lesions). The degree/direction of rotation mildly correlated with the degree of abdominal compression in the anterior-posterior direction in prone position (r = 0.427 [P = 0.004] and r = 0.404 [P = 0.007]).
CONCLUSION: The ascending colon was usually found to rotate externally as patients moved from supine to prone positions, partly dependent on the degree of abdominal compression.
Authors:
Ji Yeon Kim; Seong Ho Park; Seung Soo Lee; Ah Young Kim; Hyun Kwon Ha
Publication Detail:
Type:  Journal Article     Date:  2010-08-14
Journal Detail:
Title:  European radiology     Volume:  21     ISSN:  1432-1084     ISO Abbreviation:  Eur Radiol     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-02-08     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9114774     Medline TA:  Eur Radiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  353-9     Citation Subset:  IM    
Affiliation:
Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Asanbyeongwon-gil 86, Songpa-gu, Seoul, 138-736, South Korea.
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