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Middle-Aged Man Presents with Left-Sided Weakness

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Dense basilar artery sign indicating occlusion of the basilar artery



- Strong predictor of basilar artery thrombosis if there is strong clinical concern for posterior circulation stroke
- The CTA demonstrates focal occlusion of the mid-to-distal basilar artery, with partial reconstitution distally (possibly from left posterior communicating artery)
- The final annotated MIP image demonstrates the opacified basilar artery (arrows) proximal and distal to the occlusion.

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Middle age male with left sided weakness. What is the most likely diagnosis? What radiology sign is demonstrated?

Image IQ Quiz: Middle-Aged Man Presents with Left-Sided Weakness