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Pathological features of pulmonary artery IgG4-RD. Typical histopathologic features in patient 3, such as obliterative phlebitis and arteritis (A, ×100), storiform fibrosis (B, ×100) were demonstrated. Immunohistochemistry showed numerous IgG-reactive plasma cells are apparent (C, ×100). A significant proportion (46.38%) of the plasma cells also demonstrate reactivity with antibodies directed against IgG4 (D, ×100). IgG4-RD = IgG4-related disease.
