(Clockwise)
Description: Digital subtraction angiography (DSA) showing total top of the basilar artery occlusion with
absence of collateral circulation, 2. Maximum intensity projection image of CT cerebral angiography showing non
opacification of distal and basilar artery top by intravenous contrast in coronal section, 3. MIP image showing non
opacification of distal and basilar artery top by intravenous contrast in sagittal view
