CTA is again a bit tricky to interpret. There is thrombus in the left ICA terminus given the abrupt cutoff of the left A1 segment (@Key Finding 1). There is lack of opacification in the left cervical ICA as well forming a layering contrast level (red arrow @Key Finding 2) which as it turns out, is entirely flow related and due to the upstream occlusion. It somewhat mimics a dissection but the layering contrast is a bit too perfect (perfectly horizontal lines are typically the effect of gravity in radiology).

Perfusion images show a mismatched infarct with no core and large penumbra (@Key Finding 3).