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Table 2: Radiological signs of volvulus. |
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Sigmoid volvulus |
Colonic volvulus |
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Abdominal radiography |
Dilated bowel loop with hydro aerial levels |
Loop distension extending from the right upper quadrant to the epigastrium or left upper quadrant |
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“Coffee bean” sign |
Single hydro aerial level |
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Absence of gas in rectal ampoule |
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Computerized axial tomography |
Dilated bowel loop with an absence of haustra |
Colon dilatation |
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Whirlpool sign: twisting of the mesentery and mesenteric vessels |
Focal air dilatation with haustra in the left upper quadrant |
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“Bird’s beak” sign
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Whirlpool sign: twisting of the mesentery and mesenteric vessels |
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“Coffee bean” sign |
“Bird’s beak” sign |
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“X” sign: crisscrossing of intestinal loops at the site of torsion Sign of “divided wall”: due to mesenteric fat invaginating into intestinal wall |
“X” sign: the intertwining of intestinal loops at the site of torsion |
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