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Grade 3 perianal fistula; transsphincteric fistula without an abscess. Axial (A) and coronal (C, D) T2-weighted, axial (B) and coronal (E, F) contrast-enhanced fat-suppressed T1-weighted MR images show the transsphincteric fistula (arrows) crossing the external sphincter. Axial (B), and coronal (E, F) contrast-enhanced fat-suppressed T1-weighted MR images show the highly enhancing transsphincteric fistula (arrows).
