From the case:
Beak - aortic dissection (illustration)
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Image generated with Bing.com by Mohammad Salem Amer.
Case Discussion
In axial cross-section, the beak sign of aortic dissection is the acute angle created at the margin of the false lumen. It may be partially thrombosed, and is produced by the margins of the intimal flap and the outer aortic wall. It is a dependable feature that aids in differentiating between false and true lumens.
The acute "beak" angulation marks the dissection's transverse limit, where false lumen propagation occurs alongside a tear in the media.
Image generated with Bing.com by Mohammad Salem Amer.
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