Subarachnoid FLAIR hyperintensity

Dr Henry Knipe and Radswiki et al.

There is a wide range of causes for subarachnoid FLAIR hyperintensity, both pathological and artifactual. 

Differential diagnosis

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

Updating… Please wait.


Error Unable to process the form. Check for errors and try again.

Alert_accept Thank you for updating your details.