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Fig 1. A, Axial T1-weighted image with gadolinium reveals bright enhancement of thickened walls of the anterior cerebral arteries (arrow). B, Oblique projection of an MRA demonstrates fusiform aneurysmal dilatation of the A2 segments (arrows) of both anterior cerebral arteries. Alternating areas of dilation and narrowing are also seen in the middle cerebral and basilar arteries.
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