This site is targeted at medical and radiology professionals, contains user contributed content, and material that may be confusing to a lay audience. Use of this site implies acceptance of our Terms of Use.

Beak sign of arterial dissection

Dr Omar Bashir and Dr Yale Rosen et al.

The beak sign of arterial dissection represents a wedge of haematoma at the distal end of the false lumen. It is here that false lumen propagation is occurring. It manifest as an acute angle between the dissection flap and the outer wall. It may be filled with contrast enhanced blood (high attenuation) or thrombus (low attenuation)