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.