Sigmoid volvulus


The classic signs of sigmoid volvulus seen in this study are the coffee bean sign on the x-ray and the whirl sign on the CT. The sigmoid colon and its mesentery twist with subsequent marked distension of the apex which tends to point to the left upper quadrant, and distension of the proximal large bowel. This is in contrast to a cecal volvulus where the large bowel distal to the cecum is usually collapsed.