Figure 13. Rectourethral fistula. Oblique radiograph from retrograde urethrogram in a 64-year-old man with a history of brachytherapy for prostate cancer shows contrast agent in the rectum (arrowheads). Contrast agent entered the rectum via a large communication with the prostatic urethra (arrow). As expected, contrast agent is also present in the anterior urethra and bladder (B). Note radiopaque brachytherapy implants in prostatic region.