Sigmoid volvulus. Sigmoid volvulus. (A) Plain film showing a large distended loop of sigmoid colon arising from the pelvis extending up to the right upper.

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Sigmoid volvulus. Sigmoid volvulus. (A) Plain film showing a large distended loop of sigmoid colon arising from the pelvis extending up to the right upper quadrant, with proximal large bowel obstruction. This is the typical appearance of sigmoid volvulus (coffee bean sign; arrows). (B,C) A confirmed sigmoid volvulus on the CT scan. Note the ‘bird's beak’ appearance (white arrows) of the twisted sigmoid colon mesentery. Rachel E Musson et al. Postgrad Med J 2011;87:274-287 Copyright © The Fellowship of Postgraduate Medicine. All rights reserved.