Coffee bean sign

coffee bean sign is also known as

  • Omega sign
  • Kidney bean sign
  • ‘Bent inner tube’ sign
  • ‘Inverted U’ sign

coffee bean sign is not exclusive to sigmoid volvulus

Why the coffee bean sign is seen in X-Ray abdomen of sigmoid volvulus ?

  • Coffee bean sign is a classic conventional radiographic finding of sigmoid volvulus.
  • Closed loop of the sigmoid colon distends with gas,
  • Apposition of the medial walls of the dilated bowel form the cleft of the coffee bean
  • Lateral walls of the dilated bowel form the outer walls of the bean.

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