Wednesday, August 12, 2009

Hyperintense Subarachnoid Space on FLAIR

Increased FLAIR signal may be seen in the subarachnoid space in conditions other than subarachnoid hemorrhage. Differential diagnosis:
  • Acute subarachnoid hemorrhage
  • Meningitis
  • Susceptibility artifact
  • High levels of inspired oxygen (e.g., in sedated kids)
  • Meningeal metastases
  • Leaky blood-brain barrier from cerebritis, PRES
  • Delayed gadolinium clearance in renal failure
  • Acute infarction (thought to be related to slow flow)
  • Ruptured dermoid Cyst
  • Moyamoya

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