Double beak sign

Last revised by Vikas Shah on 23 May 2024

The double beak sign refers to the sharp tapering of two adjacent intestinal loops when a closed loop obstruction is caused by an internal hernia. The marked reduction in caliber results in distension of the small bowel loops within the hernia sac, as well as the upstream bowel.

History and etymology

It was first described in 1992 by Balthazar 1, but it was not until Millet 2 that the term "double beak sign" began to be used.

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