title: Immunoglobulin G4-related paratesticular fibrous pseudotumor and retroperitoneal fibrosis: a case report.
abstract: A 46-year-old man with a past history of retroperitoneal fibrosis was admitted with an enlarged, hard right testis. The paratesticular lesion showed heterogeneous hypoechogenicity on ultrasonography, low signal intensity on T1- and T2-weighted magnetic resonance imaging (MRI), and lack of diffusion restriction on diffusion-weighted MRI. Following steroid treatment, the paratesticular mass was decreased in size on follow-up computed tomography. The radiologic and clinical features are recognized as a manifestation of immunoglobulin G4-related sclerosing disease involving the paratesticular region and retroperitoneum.
authors.affiliation: Department of Radiology, Anam Hospital, Korea University College of Medicine, Seoul, South Korea.
authors.forename: Ki Hwan
authors.initials: KH
authors.lastname: Kim
authors.forename: Deuk Jae
authors.initials: DJ
authors.lastname: Sung
authors.forename: Na Yeon
authors.initials: NY
authors.lastname: Han
authors.forename: Beom Jin
authors.initials: BJ
authors.lastname: Park
authors.forename: Min Ju
authors.initials: MJ
authors.lastname: Kim
authors.forename: Sung Bum
authors.initials: SB
authors.lastname: Cho
authors.forename: Je Jong
authors.initials: JJ
authors.lastname: Kim
mesh_terms: D038524:Diffusion Magnetic Resonance Imaging; D006801:Humans; D007074:Immunoglobulin G / Q000378:metabolism*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D018218:Neoplasms, Fibrous Tissue / Q000150:complications / Q000276:immunology* / Q000473:pathology; D012185:Retroperitoneal Fibrosis / Q000150:complications / Q000276:immunology* / Q000473:pathology; D012187:Retroperitoneal Space / Q000473:pathology*; D012598:Sclerosis / Q000150:complications / Q000276:immunology* / Q000473:pathology; D013736:Testicular Neoplasms / Q000150:complications / Q000276:immunology* / Q000473:pathology; D013737:Testis / Q000473:pathology*; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D007074:Immunoglobulin G