Carotid artery dissection associated with an elongated hyoid bone.

A 36-year-old man presented with acute cerebral infarction in the right frontal lobe associated with right internal carotid artery dissection (CAD). Enhanced computed tomography revealed right greater horn of the hyoid bone in close proximity to the right internal carotid artery (ICA). It was speculated that mechanical compression of the internal carotid artery by the hyoid bone induced by neck rotation was related to ICA dissection. Greater knowledge of the association between the hyoid bone and the CAD will lead to increased awareness and appropriate diagnosis.