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Contrast-enhanced CT angiography revealed the following:
occlusion of the terminal right internal carotid artery immediately beyond the origin of the PCOM.
long segmental occlusion of the M1 segment of the right MCA
short segmental stenosis of the terminal left internal carotid artery and M1 segment of the left MCA
stenotic rather than hypoplastic A1 segments of the anterior cerebral arteries bilaterally
extensive collateral network is seen bypassing the stenotic segments