Meninges

Dural Enhancement

• Meningitis
• Metastasis
• Intracranial hypotension - sagging brain, orthostatic headache
• Post surgical

Leptomeningeal Enhancement

• Pia and arachnoid mater
• Extends into sulci versus dural enhancement does not
• Subarachnoid hemorrhage and supplemental O2 can also give increased signal on FLAIR in the subarachnoid spaces

Differential

• TB
• Fungal (coccidiomycosis)
• Sarcoidosis
• Carcinomatosis
• Lymphoma
• Metastasis