The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.

You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)

Fig. 7D. —18-year-old man with Crohn's disease and two previous surgeries for perianal suppuration who was referred to rule out occult infection. No external openings were seen on perineum. Sonography revealed complex disease. Transverse transperineal sonogram more caudally in anal canal than C shows additional transphincteric sinus tract with internal opening at 11 o'clock position (arrow). This tract crosses both internal and external anal sphincter and extends into right ischioanal fossa at which it ends blindly.