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A An illustration of central sclerosis in a case of immunoglobulin (Ig)G4 disease involving the lung (hematoxylin and eosin stain, original magnification ×10). B Illustration of phlebosclerosis in a case of IgG4 disease involving the mediastinum and mesentery (hematoxylin and eosin stain, original magnification ×20). C Illustration of storiform fibrosis in a case of IgG4 disease involving the mediastinum and mesentery (hematoxylin and eosin stain, original magnification ×20)
