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Grade 4 perianal fistula; transsphincteric fistula with an abscess. Axial fat-suppressed T2-weighted (A, B), axial (C, D) and coronal (E, F) contrast-enhanced fat-suppressed T1-weighted MR images show an abscess in the intersphincteric space, located posterior to the anal canal (arrowheads) and transsphincteric fistula (arrows).
