Chronic and Subacute Meningitis: Differentiating Neoplastic From Non-Neoplastic Etiologies.

BACKGROUND AND PURPOSE: Although incidence rates vary, infectious, autoimmune, and neoplastic diseases can all cause chronic and subacute meningitis (CSM). We report a Latin-American, single center, CSM case series, analyzing the main clinical characteristics as well as ancillary diagnostic methods differentiating neoplastic from non-neoplastic etiologies. METHODS: Retrospective review of CSM cases from a single center in Buenos Aires, Argentina. RESULTS: Seventy patients with CSM diagnosis were identified, 49 with neoplastic and 21 with non-neoplastic meningitis. A history of previous cancer was significantly higher in neoplastic cases, whereas prevalence of autoimmune disease and fever was more common in non-neoplastic meningitis. C-reactive protein values were higher in non-neoplastic CSM, as was pleocytosis in cerebrospinal fluid analysis. The most frequent etiologies were breast and lung cancer for neoplastic meningitis cases; and idiopathic, tuberculous, and fungal infection for non-neoplastic cases. CONCLUSIONS: Chronic and subacute meningitis diagnosis is challenging in daily neurological practice. The results we report contribute information from Latin America regarding etiologies of CSM, which can be identified after a comprehensive evaluation in a majority of cases.