| Summary: | A 38-year-old woman was admitted to hospital because of fever and headache. Increased cerebrospinal cell count and protein without evidence of infection led to a diagnosis of aseptic meningitis. Although she improved with acyclovir and glyceol, she experienced left forearm pain and sensory disturbance with drop fingers. Poor derivation of compound muscle action potentials in the left radial nerve was observed, leading to a diagnosis of mononeuritis multiplex with sensorimotor neuropathy. Because the patient had primary Sjögren’s syndrome with anti-Ro/SS-A antibody and salivary gland hypofunction, treatment with methylprednisolone, intravenous immunoglobulin, and intravenous cyclophosphamide was followed by oral glucocorticoid therapy. After these intensive therapies, her drop fingers gradually improved, although sensory disturbance remained. In conclusion, we report a case of aseptic meningitis and subsequent mononeuritis multiplex that was successfully treated with intensive immunotherapy in a patient with primary Sjögren’s syndrome.
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