[Primary urothelial carcinoma of the prostate: a case of spread along ducts and into seminal vesicles].

A 75-year-old man was referred to our department with prostate cancer. When our pathologist reviewed the biopsy specimen, he was diagnosed as intraductal urothelial carcinoma. Transurethral random biopsy showed the urothelial carcinoma in the prostate ducts but no cancer in the bladder. He was diagnosed as primary urothelial carcinoma of the prostate ducts (cTis pd cN0 M0), and radical cystoprostatectomy were performed. Histopathological examination showed urothelial carcinoma in situ spread along ducts and ejaculatory ducts and into seminal vesicles but there was not invasion of prostatic stroma. (pTis pd pN0 M0 Urothelial carcinoma G3 pL0 pV0) He had no adjuvant therapy, he is alive without any evidence of tumor recurrence after surgery.