Subarachnoid FLAIR hyperintensity

Changed by Henry Knipe, 5 Apr 2017

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

Differential diagnosis

Pathological causes

subarachnoid haemorrhage
meningitis
leptomeningeal carcinomatosis
acute stroke (intravascular, due to slow flow^1,4)
moya moya disease
leptomeningeal melanosis
fat containing lesions in subarachnoid space
- lipoma
- ruptured dermoid cyst

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 neovascularisation⁷
CSF flow artifact
vascular pulsation artifact
magnetic susceptibility artifact
motion artifact

~~-<a href="/articles/acute-stroke">acute stroke</a> (intravascular, due to slow flow 1,4)</li>~~
+<a href="/articles/acute-stroke">acute stroke</a> (intravascular, due to slow flow 1,4)</li>
~~-<li>recent gadolinium administration <ul><li>lasting ~2-24 hours, especially if there is adjacent pathology which involves disruption of the blood-brain barrier, or neovascularisation 7~~
+<li>recent gadolinium administration <ul><li>lasting ~2-24 hours, especially if there is adjacent pathology which involves disruption of the blood-brain barrier, or neovascularisation 7

Images Changes:

Image 2 MRI (FLAIR) ( update )

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Case 42: from moya moya

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Image 3 MRI (FLAIR) ( update )

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