Solitary Testicular Metastasis of Prostate Cancer Mimicking Primary Testicular Cancer

We report a rare case of testicular metastasis from prostate cancer. A 68-year-old patient presented with a right testicular mass with discomfort. He had a history of robot-assisted laparoscopic radical prostatectomy and had received adjuvant radiation therapy and had been treated with androgen deprivation therapy continuously at another institution. We performed a right inguinal orchiectomy. The testicular mass was diagnosed as a metastasis from prostate carcinoma.