Coffee-bean sign

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.


Inspired signs
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Article Information:

rID: 1145
Section: Signs
Synonyms or Alternate Spellings:
  • Coffee bean sign
  • Bent inner tube sign
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    Figure 1: coffee bean
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    Coffee bean sign.
    Case 1: with perforation
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    Case 2
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    Case 3
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    Case 5: on virtual colonoscopy
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