Fig. 3

A Preoperative sagittal T2-weighted image showing large thick-walled T2 hypointense structure posterior and superior to the prostate (red arrow) with possible fistula to the sigmoid colon at its superior aspect. There is also a fibrous band or adhesion between the proximal rectum and distal rectum or anal canal. B Coronal image again showing thick-walled mass with adhesion to the distal sigmoid colon (red arrow). This image also demonstrates prolapse or perirectal fat and rectum through the external sphincter. C Axial image showing relationship of rectum, unknown mass (red arrow), seminal vesicles, and bladder. D Sagittal oblique postcontrast images again showing apparent fistula to sigmoid colon (blue arrow) and enhancing tract extending toward the distal prostatic urethra (red arrow)