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Washington University Experience | MISCELLANEOUS | Idiopathic Hypertrophic Pachymeningitis (IgG4 Disease) | 1B6 Idiopathic Hypertrophic Pachymeningitis (hyper-IgG4, Case 1) dura H&E 12

Although the dural specimen has plenty of organized fibrous tissue, the infiltrate is associated with more disorganized proliferation of fibrous tissue. Rare vasculitis in the absence of necrotizing granulomatous inflammation was seen. (H&E)

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