Case report presents misdiagnosed hypertrophic pachymeningitis with elevated IgG4 and MPO-ANCA positivity, suggesting diagnostic complexities.
To present a case of hypertrophic pachymeningitis in a patient with elevated immunoglobulin G4 (IgG4) subclass and positivity for anti-myeloperoxidase anti-neutrophil cytoplasmic antibody (MPO-ANCA) initially misdiagnosed as central nervous system lymphoma (CNS) lymphoma.
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Callaghan et al. (2026) studied this question.
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