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Grade 1 perianal fistula; linear intersphincteric. Axial (A) and coronal (B) fat-suppressed T2-weighted, axial contrast-enhanced fat-suppressed T1-weighted (C) MR images show the left intersphincteric fistula (arrows) surrounded by the external sphincter without an abscess or secondary branch. Hyperintense fistula tract on fat-supressed T2-weighted MR images (A, B arrows). Tract enhancement on contrast-enhanced fat-suppressed T1-weighted image (C arrow).
