CTA head-neck 2.5 hours later, post-thrombolysis therapy
The right internal carotid artery (RICA) is occluded immediately distal to its origin for its entire length, apparently an acute occlusion, probably due to a fresh thrombus or perhaps dissection.
The arteries of the right cerebral hemisphere are filled via the circle of Willis, albeit substantially less than the left arteries.
The rest of the neck arteries (not shown in their entirety on the axial view) are patent, with moderate atherosclerotic changes.
The right vertebral artery shows several stenoses - atherosclerotic in nature? spasm?