PMC4584440_01
(a) Preoperative angiogram, right vertebral artery injection, with head in a neutral position anterior-posterior (AP). (b) Preoperative angiogram, right vertebral artery injection, with head in neutral position (lateral)
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F1
Subsequently, the patient underwent a dynamic cerebral angiogram, which revealed complete proximal occlusion of the right vertebral artery with the head turned toward the right [Figures 1a and b and 2a and b].
(a) Preoperative angiogram, right vertebral artery injection, with head turn rotated right (AP). (b) Preoperative angiogram, right vertebral artery injection, with head turn rotated right (lateral)
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F2
Subsequently, the patient underwent a dynamic cerebral angiogram, which revealed complete proximal occlusion of the right vertebral artery with the head turned toward the right [Figures 1a and b and 2a and b].
Intraoperative angiogram, right vertebral artery injection, with patient's head in neutral position (AP)
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F3
An intraoperative cerebral angiogram initially imaged the right vertebral artery in neutral position [Figure 3].
Intraoperative angiogram, right vertebral artery injection, with patient's head fully turned toward the right
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F4
When the head was turned toward the right, the artery maintained normal flow [Figure 4].