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. 2023 Jun 5:1–3. Online ahead of print. doi: 10.1007/s10072-023-06887-6

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Fig. 1 — The “claustrum sign”. Brain MRI shows bilateral claustrum hypointensity on T1-weighted images (A) and hyperintensity on fluid-attenuated inversion recovery images (B). Diffusion-weighted imaging (C) and apparent diffusion coefficient images (D) reveal restrictive diffusion of the bilateral claustrum