Rheumatoid Meningitis Mimicking Progressive Supranuclear Palsy

Introduction: Rheumatoid meningitis is an uncommon manifestation of longstanding rheumatoid arthritis and few cases have been described. The clinical presentation is extremely variable as reported in medical literature. Case Report: We report a 71-year-old woman with 15 years of seropositive rheumatoid arthritis who developed neurological complications: cognitive deterioration; hypomimia; limitation on vertical gaze; and axial stiffness, resembling progressive supranuclear palsy and seizures. Brain magnetic resonance imaging showed a diffuse dural plaque on both frontal and temporal lobes exhibiting homogeneous gadolinium enhancement. There was diffuse leptomeningeal enhancement and hyperintense white matter lesions. The final diagnosis made by image-guided biopsy showed rheumatoid pachymeningitis. After the definitive diagnosis, high doses of corticosteroids and immunosuppressive treatment were started. Conclusions: We emphasize the diagnostic importance of the biopsy in cases of chronic pachymeningitis and stress that diverse entities can cause progressive supranuclear palsy-like phenotypes.