IgG4-related Sclerosing Mastitis: Description of a New Member of the IgG4-related Sclerosing Diseases

Immunoglobulin G (IgG)4-related sclerosing disease is a recently described syndrome characterized by mass-forming lesions in various organs due to dense lymphoplasmacytic infiltrates and stromal sclerosis, elevated serum IgG4 titer, increased tissue IgG4+ plasma cells, and favorable clinical outcome. We describe 4 patients with IgG4-related sclerosing mastitis, which represents a new member of this family of diseases. All patients were female...