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Washington University Experience | MISCELLANEOUS | Idiopathic Hypertrophic Pachymeningitis (IgG4 Disease) | 4A5 IgG4-Related Hypertrophic Pachymeningitis (AANP 2012 Case 8) H&E 11

4A5-7 The inflammatory infiltrate in this case was heterogenous consisting of lymphocytes, plasma cells germinal center elements and eosinophils (4A8). Special stains performed on this material and reported at the AANP DSS in 2012 showed an IgG4 count of 80 plasma cells/HPF and an IgG4/IgG ratio of 15%. (AANP Diagnostic Slide Session 2012, Case 8)

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