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JAMA neurology
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Review
IgG4-related hypertrophic pachymeningitis: clinical features, diagnostic criteria, and treatment.
IgG4-related hypertrophic pachymeningitis (IgG4-RHP) is an increasingly recognized manifestation of IgG4-related disease, a fibroinflammatory condition that can affect virtually any organ. It is estimated that IgG4-RHP may account for a high proportion of cases of hypertrophic pachymeningitis once considered idiopathic. ⋯ IgG4-related disease accounts for an increasing proportion of cases of idiopathic hypertrophic pachymeningitis. Clinicians should become familiar with this alternative differential diagnosis because a prompt, specific therapeutic approach may avoid long-term neurological complications.