Testicular inflammation as a new manifestation of IgG4-associated disease.

IgG4-related disease has properties of a systemic disorder but simultaneously is associated with a growing list of organ-specific manifestations including autoimmune pancreatitis, IgG4-associated cholangitis, IgG4-related kidney disease, and IgG4-associated prostatitis. In this study, we present, to the best of our knowledge, the first case of a patient with multiorgan IgG4-related disease who lost his testes because of IgG4-related testicular inflammation. We postulate that IgG4-related disease in the urogenital tract is not restricted to IgG4-related kidney disease and prostatitis, but that this rare disorder may also affect the testis.