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Washington University Experience | MISCELLANEOUS | Idiopathic Hypertrophic Pachymeningitis (IgG4 Disease) | 1H1 Idiopathic Hypertrophic Pachymeningitis (hyper-IgG4, Case 1) dura ISH Lambda 1

1H1-3 In comparison, there is less overall staining for Lambda but clearly the population of cells is most consistent with polytypia, with a kappa to lambda ratio of 3–4:1.

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