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Fig. 11 —57-year-old woman with small-bowel volvulus. Axial CT scan through upper pelvis shows whirl sign (arrow) signifying volvulus. Volvulus can result if loop of bowel is able to rotate around its mesentery. If loop sits in axial plane, it will appear as or shape. If orientation of loop is at right angle to axial plane, appearance will vary depending on slice.