| Pachymeningeal | Leptomeningeal |
| • Intracranial hypotension | • Infectious meningitis |
| • Infection (syphilis, tuberculosis) | • Inflammatory (sarcoidosis) |
| • Inflammatory (sarcoidosis) | • Neoplastic meningitis |
| • Lymphoma/leukemia | |
| • Neoplastic meningitis | |
| • Granulomatosis with polyangiitis |
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