Ascending colon rotation following patient positional change during CT colonography: a potential pitfall in interpretation
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Ji Yeon Kim & Seong Ho Park & Seung Soo Lee & Ah Young Kim & Hyun Kwon Ha
- چاپ و سال / کشور: 2010
Description
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 (پ‹) 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 .23پ‹ and 79پ‹ (median, 21پ‹), demonstrating external rotation of the ascending colon in almost all cases (2پ‹ to 79پ‹ 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.
Eur Radiol (2011) 21:353–359 DOI 10.1007/s00330-010-1928-y Received: 4 May 2010 / Revised: 9 July 2010 / Accepted: 28 July 2010 / Published online: 14 August 2010
