[Rheumatoid leptomeningitis: a case report and literature review].

To report the clinical, radiological and neuropathological findings of a patient with rheumatoid meningitis. The patient was a 71-year-old Chinese man with a two-year history of rheumatoid arthritis and no other significant medical history, who presented to our hospital recurrent weakness of his left extremities, dysarthria and a continuous bilateral hand tremor. Cerebrospinal fluid (CSF) and serum examinations were normal apart from a mildly raised serum perinuclear antineutrophil cytoplasmic autoantibody (p-ANCA). Brain magnetic resonance imaging (MRI) showed leptomeningeal enhancement in both frontal and parietal lobes, in addition to several old white matter infarcts. Meningeal biopsy showed numerous infiltrating macrophages and lymphocytes within the leptomeninges. The patient responded clinically and radiologically to corticosteroid and cyclophosphamide therapy. The patient subsequently developed herpes zoster over his left chest as a complication of his immunosuppressive treatment. His cyclophosphamide was ceased and intravenous immunoglobulin (IVIG) therapy was commenced, with good clinical response to both the herpes zoster and meningitis. According to the result of the biopsy, aseptic meningitis was considered the MRI results and the patient's clinical history were given, and a diagnosis of rheumatoid meningitis was made. The patient was p-ANCA positive. Although there was no evidence for cerebral vasculitis on biopsy, it remains a possibility that the patient's recurrent minor cerebral infarcts visible on MRI were vasculitic in nature.