Prostate biopsy in patients after proctectomy.

Until the discovery of prostate specific antigen as a tool to detect prostate carcinoma, the rectum has always been necessary to allow the best evaluation and biopsy of the prostate, whether by digital examination or transrectal ultrasound. We describe a simple, accurate, computerized tomography-guided method to biopsy the prostate in men who have undergone proctectomy.