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CIS = 3. (A) Injection of the left ICA demonstrates occlusion of proximal left MCA (ischemic territory = left MCA) with partial opacification of the left fronto-parietal lobes via pial collaterals of the left ACA. (B) Injection of the left vertebral artery demonstrates partial opacification of the left temporal lobes via pial collaterals. (C) Delayed venous phase of the left ICA and the left vertebral artery. All the ischemic territory (left MCA) demonstrates capillary blush. CIS = 3.
