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.
Aged ; Autoimmune Diseases/diagnosis ; Female ; Granuloma, Plasma Cell/*diagnosis ; Humans ; Immunoglobulin G/*immunology ; Pancreatitis/diagnosis/immunology ; Sclerosis ; Urethral Diseases/*diagnosis/immunology