Table 2. Causes of Hypertrophic Pachymeningitis.

Inflammatory/autoimmune [23-25]	Idiopathic (67%) ANCA-associated vasculitis (15%) IgG4-related disease Sarcoidosis Rheumatoid arthritis Sjogren syndrome Systemic lupus erythematosus Giant-cell arteritis
Infectious [24]	Tuberculous meningitis (8%) Viral meningitis (6%) Bacterial meningitis (4%)
Neoplastic [24]	Lymphoma Meningioma Histiocytosis Carcinomatous meningitis
Other [24]	Previous surgical procedure Cerebrospinal fluid hypotension

ANCA: antineutrophil cytoplasmic antibody.