Need an MRI without contrast with SWAN sequence.
DAI Grade | Location | MRI Clues | Clinical Outcome |
I | Subcortical white matter (gray–white junctions) | Tiny foci in frontal/parietal lobes | Mild, transient LOC |
II | + Corpus callosum | Callosal lesions (esp. splenium) | Prolonged coma, worse prognosis |
III | + Brainstem | Midbrain/pons lesions | Deep coma, poor prognosis |
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