IgG4-related disease and Rosai-Dorfman-Destombes disease
eosinophilic granulomatosis with
polyangiitis, also show increased
IgG4-positive plasma cells in tissue
and elevated serum IgG4.2,3 Rarely,
tissue infiltration of IgG4-positive
plasma cells exceeding the thresholds
established for diagnosis of IgG4-RD
(eg, >100 cells per high-powered
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