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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.

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