title: Immunoglobulin G4-related sclerosing disease involving the urethra: case report.
abstract: Immunoglobulin G4 (IgG4)-related sclerosing disease is a systemic disease characterized by extensive IgG4-positive plasma cells and T-lymphocyte infiltration in various organs. We described the imaging findings of an IgG4-related inflammatory pseudotumor in the urethra. The urethral mass showed isoattenuation on unenhanced CT images, delayed enhancement on enhanced CT images, iso- to slight hyper-intensity on T1 and T2 weighted magnetic resonance images, diffusion restriction on diffusion weighted images, and heterogeneously low echogeneity on ultrasonography.
authors.affiliation: Department of Radiology, Seoul National University College of Medicine, and Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul 110-744, Korea.
authors.forename: Jin Woo
authors.initials: JW
authors.lastname: Choi
authors.forename: Sang Youn
authors.initials: SY
authors.lastname: Kim
authors.forename: Kyung Chul
authors.initials: KC
authors.lastname: Moon
authors.forename: Jeong Yeon
authors.initials: JY
authors.lastname: Cho
authors.forename: Seung Hyup
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000368:Aged; D001327:Autoimmune Diseases / Q000175:diagnosis; D005260:Female; D006104:Granuloma, Plasma Cell / Q000175:diagnosis*; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology*; D010195:Pancreatitis / Q000175:diagnosis / Q000276:immunology; D012598:Sclerosis; D014522:Urethral Diseases / Q000175:diagnosis* / Q000276:immunology
chemical_list: D007074:Immunoglobulin G
keywords: IgG4; Immunoglobulin G4-related sclerosing disease; Inflammatory pseudotumor; Urethra