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Figure 1: A 30-year-old female with atlanto-axial dislocation. Three-dimensional computed tomographic angiography demonstrating the abnormal course of bilateral vertebral arteries; (a) Both the VAs are seen to travel laterally from the C2 foramen and enter the cranial cavity through an osseous foramen in the condyle. A fenestration of a short segment of the left VA can be seen (arrow in b). Furthermore, note can be made of the right sided VA dominance in this patient

Figure 1: A 30-year-old female with atlanto-axial dislocation. Three-dimensional computed tomographic angiography demonstrating the abnormal course of bilateral vertebral arteries; (a) Both the VAs are seen to travel laterally from the C2 foramen and enter the cranial cavity through an osseous foramen in the condyle. A fenestration of a short segment of the left VA can be seen (arrow in b). Furthermore, note can be made of the right sided VA dominance in this patient