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Figure 2: A 16-year-old male with atlanto-axial dislocation. Three-dimensional CT angiography demonstrating the abnormal course of both vertebral arteries (a). The left VA, after its exit from the C2 transverse foramen, follows a lateral course and then enters the cranium through a foramen in the occipital condyle. This can be clearly appreciated in the cranial reconstruction view; (b) On the right side, there is a persistent first intersegmental artery as the right VA courses posteromedially from C2 and enters the cranium by passing under the C1 arch

Figure 2: A 16-year-old male with atlanto-axial dislocation. Three-dimensional CT angiography demonstrating the abnormal course of both vertebral arteries (a). The left VA, after its exit from the C2 transverse foramen, follows a lateral course and then enters the cranium through a foramen in the occipital condyle. This can be clearly appreciated in the cranial reconstruction view; (b) On the right side, there is a persistent first intersegmental artery as the right VA courses posteromedially from C2 and enters the cranium by passing under the C1 arch