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DSA (A) and 3D-TOF-MRA (C) with respective magnifications (B and D) of a patient with primary central nervous system vasculitis. Subtle irregularities of the arterial lumen of the A2–A3 segments of the left anterior cerebral artery are shown in a patient with otherwise near-occlusive stenoses of left intracranial internal carotid artery extending to the initial portion of the left MCA.
