The whirl sign in caecal volvulus: a decisive diagnostic clue.

The case of a 35-year-old woman with acute right flank pain, right iliac fossa pain, nausea and vomiting for 6 hours is presented. Plain abdominal radiography and CT scan were performed to find the etiology. These exams showed no signs of colonic obstruction but thickened non-enhancing wall of caecum with ascites was suggestive for ischemia. The whirl sign depicted on CT was the decisive feature for the diagnosis of caecal volvulus.