A case of urethral metastasis of castration-resistant prostate cancer successfully cured with CyberKnife radiosurgery

Distant urethral metastasis of the castration-resistant prostate cancer (CRPC) is very rare. In this case report, we present a 69-year-old man who was first diagnosed prostate cancer from the sessile papillary tumor in the prostatic urethra which recurred after surgery and androgen deprivation therapy and finally treated with CyberKnife radiosurgery. There has been no recurrence for 50 months. To the best of our knowledge, there is no case of urethral metastasis of the CRPC successfully controlled with CyberKnife radiosurgery in the literature.