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Figure 2: (a and b) Digital subtraction angiogram shows opacification of the right Posterior Cerebral Artery (PCA) (blue arrow) through a dominant right posterior communicating artery (orange arrow). (c and d) Digital subtraction angiography shows opacification of the left PCA (orange arrow) and the basilar artery (black arrow) through a dominant left posterior communicating artery (blue arrow). (e and f) Digital subtraction an giography of right VA shows hypoplastic VA all along its length with further attenuation of its V4 segment (arrowhead), which is only seen as a faint stream of contrast. (g and h) Digital subtraction angiography of left VA shows hypoplastic VA all along its length with further attenuation of V4 segment (orange arrow). Note the absence of opacification of the rest of the posterior circulation, except for normal parenchymal blush in the left Posterior Inferior Cerebellar Artery (PICA) territory (star). VA = vertebral artery

Figure 2: (a and b) Digital subtraction angiogram shows opacification of the right Posterior Cerebral Artery (PCA) (blue arrow) through a dominant right posterior communicating artery (orange arrow). (c and d) Digital subtraction angiography shows opacification of the left PCA (orange arrow) and the basilar artery (black arrow) through a dominant left posterior communicating artery (blue arrow). (e and f) Digital subtraction an giography of right VA shows hypoplastic VA all along its length with further attenuation of its V4 segment (arrowhead), which is only seen as a faint stream of contrast. (g and h) Digital subtraction angiography of left VA shows hypoplastic VA all along its length with further attenuation of V4 segment (orange arrow). Note the absence of opacification of the rest of the posterior circulation, except for normal parenchymal blush in the left Posterior Inferior Cerebellar Artery (PICA) territory (star). VA = vertebral artery