[A Case of Granulomatous Orchitis].

A 54-year-old man presented with slight pain and swelling of the right scrotum. On performing scrotal ultrasonography, the right testis showed swelling and diffused hypoechogenicity compared with the left normal testis. T2-weighted magnetic resonance imaging (MRI) revealed swelling and low intensity areas in the right testis. Diffusion-weighted MRI revealed increased diffusion in the right testis. A testicular tumor was suspected and right high orchitectomy was performed. Histopathological diagnosis was granulomatous orchitis. To our knowledge, this is the 22nd case in Japan.