Assertion: carotid artery dissection | /r/CapableOf | begin as tear
Facets:
value: within the tunica media
type: LOCATION
value: in the tunica intima
type: LOCATION
Source sentences:
text: Carotid artery dissection begins as a tear in the tunica intima or directly within the tunica media (possibly originating from the vasa vasorum).  
text: Background Carotid artery dissection begins as a tear in one of the carotid arteries of the neck, which allows blood under arterial pressure to enter the wall of the artery and split its layers.
text: Carotid artery dissection begins as a tear in the tunica intima or directly within the tunica media (possibly originating from the vasa vasorum).