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A diffusion abnormality observed in diffusion-weighted magnetic resonance imaging (MRI) of the brain. Molecular diffusion refers to the notion that any type of molecule in a fluid (eg, water) is randomly displaced as the molecule is agitated by thermal energy. Restricted diffusion of water appears bright on diffusion-weighted images. [ORCID:0000-0002-7440-8864, PMID:11058626]
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