Tuberc Respir Dis > Volume 67(4); 2009 > Article
Tuberculosis and Respiratory Diseases 2009;67(4):359-363.
DOI:    Published online October 1, 2009.
Two Cases of Pulmonary Involvement of Immunoglobulin G4 Related Autoimmune Disease.
Jung Wan Yoo, Jae Hyung Roh, Chae Man Lim, Sang Do Lee, Woo Sung Kim, Dong Soon Kim, Jin Woo Song
Department of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
Immunoglobulin G4 (IgG4) related autoimmune diseases are characterized by high serum IgG4 concentrations, sclerosing inflammation of numerous IgG4-positive lymphoplasma cells of varying origin, and a positive response to steroid treatment. Autoimmune pancreatitis, sclerosing cholangitis, and retroperitoneal fibrosis are representative presentations of IgG4 related autoimmune disease. Herein, we describe 2 patients (40-years-old woman and 47-years-old man) diagnosed with pulmonary involvement of IgG4-related autoimmune disease. The patients were admitted for an evaluation of the lung mass or multiple lung nodules found on chest radiography. Surgical lung biopsies were performed and pathologic finding revealed lymphoplasmacytic sclerosing inflammation with numerous IgG4 positive cells. The patients had elevated serum total IgG and IgG4 levels. Treatment consisted of high dose methylpredinisolone (1 mg/kg/day) and demonstrated good responsiveness. However, one patient experienced 2 relapses while being tapered off of steroid treatment.
Key Words: Immunoglobulin G, Lung involvement, Autoimmune diseases

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