Rheumatoid Meningitis Occurring during Etanercept Treatment

We report a 65-year-old man who had repetitive seizures 6 months after receiving etanercept, methotrexate, and prednisolone for rheumatoid arthritis. Mononuclear cells were mildly increased in the cerebrospinal fluid (CSF). Brain magnetic resonance imaging (MRI) showed high intensity along sulci of the frontal and parietal lobes. Brain biopsy revealed lymphocyte and plasma cell infiltration in the meninges, confirming the diagnosis of rheumatoid meningitis. After steroid pulse therapy, seizures resolved and clinical findings improved. When etanercept was replaced by tocilizumab, rheumatoid meningitis did not recur. Although TNF-α inhibitors can control joint symptoms of rheumatoid arthritis, they may induce rheumatoid meningitis.

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