Sudden coma due to simultaneous basilar artery and bilateral carotid artery occlusion.

Fig. 1. Perfusion CT scan showing extensive perfusion defects in the bilateral carotid territories and whole brainstem (arrow). Extensive deficits of cerebral blood flow (CBF) and cerebral blood flow volume (CBV) represent a large ischemic core in the bilateral hemispheres and brainstem. Fig. 2. CT angiogram showing tapered occlusions of both internal carotid arteries and occlusion of the basilar artery. CT angiogram source images show the arterial occlusion (dotted white arrows) ( a ) and tapered occlusion of the bilateral internal carotid arteries (arrows) ( b ). Sagittal image of the CT angiogram shows the occlusion of the basilar artery in the pontine level (dotted arrows) (c). 1