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Pathological findings in right submandibular gland. A) Hematoxylin and Eosin staining (×200), B) EVG (×200), C) IgG (×200), D) IgG4 (×200). Prominent lymphocytic and plasma cell infiltration with fibrosis and obliterating phlebitis are evident. Immunohistochemical staining reveals IgG4-positive cellular infiltration (IgG4/IgG >70%).
