On the axial non-contrast, there are extensive hypodensities in the thalamus, cerebellum, brain stem, mesencephalon, pons and mesiotemporal regions consistent with ischaemia. Dense vessel sign of the basilar artery. Ventricles are symmetrical and non-dilated. Normal gyration. No indication of haemorrhage.
The contrast study demonstrated a total occlusion of the basilar artery at the vertebrobasilar junction. Only partial filling of the right posterior cerebral artery, P1 and P2.
The perfusion maps show perfusion defects on all 4 perfusion maps (only MTT shown) of the thalamus, cerebellum, brain stem, mesencephalon and pons.
Conclusion: Extensive ischaemia of the posterior circulation due to an occlusion of the basilar artery.