The left vertebral artery from its origin up to the C3/C4 level is not opacified, showing circumferential high T1/T2 fat sat signal changes with a crescent appearance at the C3/C4 level.
Distally, it appears opacified but narrowed compared to the right side.
The common carotid, internal, and external carotid arteries bilaterally appear normal without significant stenotic or obstructive pathology.
The right vertebral artery appears normal.
The terminal portions of both internal carotid arteries and basilar arteries and their main branches appear normal.