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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. A near-occlusive stenotic lesion of the proximal middle cerebral artery segment extending to both superficial branches with a pseudodilation of the bifurcation is shown. Arterial lumen irregularities are also observed in A2 segments of both anterior cerebral arteries.
