case_images: PMC9894333_01
case_images: PMC9894333_02
case_images: CTA of the head and neck.. A) Occlusion of the left common carotid-subclavian artery bypass graft. B) Occlusion of the left subclavian artery stent. C) Patency of the vertebral arteries bilaterally. D) Patency of the basilar artery.
  CTA: computed tomography angiography
case_images: cureus-0015-00000033310-i01.jpg
case_images: PMC9894333_02_cureus-0015-00000033310-i01.jpg
case_images: FIG1
case_images: However, there was a visualization of bilateral vertebral arteries all the way from the origin and a widely patent basilar artery (Figure 1).
case_images: Carotid DSA.. A) Fluoroscopic dye injection into the left common carotid artery. B) Transmission of fluoroscopic dye to the left subclavian and left vertebral arteries, visualized as opacification of the vessels, indicating retrograde flow from the left common carotid artery.
  DSA: digital subtraction angiography
case_images: cureus-0015-00000033310-i02.jpg
case_images: PMC9894333_02_cureus-0015-00000033310-i02.jpg
case_images: FIG2
case_images: Carotid DSA then demonstrated complete occlusion of the left subclavian artery stent, which could not be recanalized despite multiple attempts, and SSS as indicated by retrograde flow from the left common carotid artery with filling of the left subclavian and left vertebral arteries (Figure 2).
case_images: PMC9894333_03
case_images: PMC9894333_04