A 79-year-old woman presented with subacutely worsening headaches and right arm weakness. MRI showed diffuse pachymeningeal enhancement. Serologic workup revealed elevated erythrocyte sedimentation rate and C-reactive protein. CSF demonstrated elevated opening pressure, a lymphocytic pleocytosis, and elevated protein. We discuss our differential diagnosis and distinguish between 2 overlapping clinical entities.
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Sheth et al. (2024) studied this question.
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