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Fig. 7C. —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 of mid anal canal shows internal opening (arrowhead) posteriorly at 6 o'clock position. Bulk of caudal aspect of perianal and perirectal abscess (arrow) extends cranially in intersphincteric plane.