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Washington University Experience | MISCELLANEOUS | Idiopathic Hypertrophic Pachymeningitis (IgG4 Disease) | 1B4 Idiopathic Hypertrophic Pachymeningitis (hyper-IgG4, Case 1) dura H&E 2

1B4,B5 Higher magnification image of the plasma cell component demonstrates the well differentiated appearance of individual cells (H&E). CD138 (not illustrated) showed an increased number of plasma cells, both singly scattered and clustered, which comprised approximately 30% of the cells in the infiltrate.

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