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Background  TNFα blockers have drastically improved rheumatoid arthritis prognosis by preventing joint destruction in DMARD resistant patients. Altering cytokine balance in immune diseases may expose to paradoxical adverse events.    Case presentation  We present the case of a 40-year-old woman, with a confirmed erosive and seropositive RA, successfully treated by TNFα blocker (etanercept) for seven years, and who developed a severe neurosarcoidosis. She had lymphocytic meningitis, bilateral peripheral facial paralysis and anosmia, associated with bilateral hilar lymph nodes, papilloedema, anterior uveitis and elevated serum angiotensin-converting enzyme level. Magnetic resonance imaging showed a bilateral thickening of the Gasser’s ganglia walls and enhanced signal of the vestibulocochlear, the facial and the proximal portion of trijeminal nerves.    Conclusion  This case raised the issue of the imputability of etanercept in the development of neurosarcoidosis. Neurological symptoms onset in patients on TNFα blockers should lead to exclude infections, induced lupus but also paradoxical neurosarcoidosis.

Etanercept may induce neurosarcoidosis in a patient treated for rheumatoid arthritis