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A and B, Pathologic specimen in low power (A, magnification ×40) and high power (B, magnification ×200). Note nerve fibers (A, arrowhead) surrounded by a attenuated inflammatory infiltrate (B) with moderate fibrosis. C, (magnification × 200). Immunohistochemistry indicates abundant IgG4-positive plasma cell infiltration (128/HPF) in and around the aggregates of lymphocytes and high ratios of IgG4+/IgG+ plasma cells (>71%).
