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Figure 1: (a and b) Craniocervical CTA shows an unopacified left vertebral artery from the origin (arrow), which is filled distally in a retrograde manner (arrowhead). Thrombus in the basilar artery (white arrow). (c and d) DSA confirms the proximal basilar artery occlusion (white arrow) and a left vertebral artery filled in a retrograde manner (arrowhead). The left vertebral artery is filled from the left subclavian artery, without any sign of stenosis, occlusion or dissection (arrow)

Figure 1: (a and b) Craniocervical CTA shows an unopacified left vertebral artery from the origin (arrow), which is filled distally in a retrograde manner (arrowhead). Thrombus in the basilar artery (white arrow). (c and d) DSA confirms the proximal basilar artery occlusion (white arrow) and a left vertebral artery filled in a retrograde manner (arrowhead). The left vertebral artery is filled from the left subclavian artery, without any sign of stenosis, occlusion or dissection (arrow)