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FIG 1. Patient 1: 60-year-old woman with primary angiitis of the CNS (a typical case of CNS vasculitis).
A and B, Axial SE MR images (3000/34). In A, an infarct is seen in the right subcortical white matter and the deep white matter (posterior MCA distribution) (arrow). Lacunar infarcts are also present in the globus pallidi (arrowheads). In B, infarcts are present in the left subcortical white matter (PCA distribution) (white arrows) and posterior left hippocampus (black arrow). Increased signal in the putamina and midbrain are artifactual.
C, Right lateral digital subtraction angiogram reveals mild narrowing of the proximal (near the A2 segment bifurcation) and several distal pericallosal artery segments (arrows). The MCA is poorly visible.
D, Anteroposterior digital subtraction angiogram of the right common carotid artery shows significant narrowing of the right M2 segment (arrows), with consequent attenuation of the more distal segments. The left MCA was normal.
E and F, Anteroposterior left vertebral artery (E) and lateral left common carotid artery (F) injections depict a fetal origin of the left PCA, with beading and occlusion of the PCA (arrows in F) and correlate with the MR image shown in B.
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