[Localized amyloidosis of the seminal vesicle: a case report].

Primary amyloidosis of the seminal vesicle is a rare disease entity. We report here a case of localized seminal vesicle amyloidosis with hematospermia. A 66-year-old man visited our hospital with a chief complaint of hematospermia. T2 weighted magnetic resonance imaging (MRI) showed a hypointensity mass in the left seminal vesicle. Needle biopsy revealed amyloidosis of the seminal vesicle. Without any specific treatment, the mass lesion disappeared on MRI, and hematospermia was improved.