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Subarachnoid FLAIR hyperintensity

The differential diagnosis for subarachnoid hyperintensity on FLAIR sequences includes:

Pathological causes
Artifactual causes
  • hyperoxygenation therapy
  • recent gadolinium administration 
    • lasting ~2-24 hours, especially if there is adjacent pathology which involves disruption of the blood-brain barrier, or neovascularisation 7
  • CSF flow artifact
  • vascular pulsation artifact
  • magnetic susceptibility artifact
  • motion artifact

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