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Washington University Experience | MISCELLANEOUS | Idiopathic Hypertrophic Pachymeningitis (IgG4 Disease) | 3G1 IgG4-related pachymeningitis (Case 3) ISH Lambda
3G1,2 In situ hybridization for immunoglobulin light chains showed presence of both lambda (G1) and kappa light chain (G2) containing plasma cells.