The coffee-bean sign (also known as bent inner tube sign 4 ) is a sign on an abdominal plain film of a sigmoid volvulus although some authors have also used the term to refer to closed loop small bowel obstructions. This contrasts to a kidney bean sign which is seen with a caecal volvulus.
This thick 'inner wall' represents the double wall thickness of opposed loops of bowel, with thinner outer walls due single thickness.
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- 1. Roche Clare J., David P. O’Keeffe, W. Kit Lee et al. “Selections from the Buffet of Food Signs in Radiology1.” Radiographics 22, no. 6 (November 2002): 1369-1384. doi:10.1148/rg.226025521.
- 2. Burgener Francis A. and Martti Kormano. Differential Diagnosis in Conventional Gastrointestinal Radiology. Thieme, 1997. ISBN: 0865776768, 9780865776760.
- 3. Monson John R. T., Graeme Duthie and Kevin O'Malley. Surgical emergencies. Wiley-Blackwell, 1999. ISBN: 0632050470, 9780632050475.
- 4. Feldman Deborah. “The Coffee Bean Sign1.” Radiology 216, no. 1 (July 2000): 178-179.
Synonyms & Alternative Spellings
|Synonyms or Alternative Spelling||Include in Listings?|
|Coffee bean sign||✗|
|Bent inner tube sign||✓|