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Grade 2 perianal fistula; intersphincteric fistula with an abscess. Axial (A) and coronal (D) T2-weighted, axial (B) and coronal (E) fat-suppressed T2-weighted MR images show high-intensity fluid collection along the right posterolateral aspect of the anal canal (arrows). Axial (C) and coronal (F) contrast-enhanced fat-suppressed T1-weighted MR images show a peripherally enhancing abscess in the intersphincteric space (arrowheads).
