Authors report a rare case of testicular metastasis from carcinoma of the prostate in a patient treated with anti-androgen therapy. The report of this kind of testicular metastasis was more frequent in the past years, when the neoplasm was often treated with bilateral orchiectomy. Metastatic carcinoma of the prostate to the testis is commonly accepted as a sign of advanced disease and it is usually accompanied by multiple metastases to other organs. The prognostic significance of testicular localization is still unknown.