Fig. 7. Complex-type intersphincteric perianal fistula in a 21-year-old female patient with perianal Crohn’s disease. (A, B) Axial T2-weighted fat-suppressed magnetic resonance images show an intersphincteric perianal fistula in the left posterior aspect of the anus (white arrows). (C, D) The white arrowhead indicates the superior aspect of the fistula where the internal opening connects to the left aspect (3’o clock, white arrowhead) of the rectum, and the black arrow indicates the inferior aspect of the fistula where the external opening connects to the posterior aspect (6’o clock) of the perineum.
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