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. 2023 May 15;15(5):3674–3685.

Figure 2.

Figure 2

A cohort of perianal fistula cases, which was classified according to Park’s classification. Oblique coronal FS T2WIs (A-C) show the fistula passes through the external sphincter, which is a trans-sphincteric perianal fistula (orange arrow). Oblique coronal FS T2WI (D) shows a intersphincteric perianal fistula (orange arrow). Oblique coronal FS T2WI (E) shows a suprasphincteric perianal fistula (orange arrow). Sagittal FS T2WI (F) shows a extrasphincteric perianal fistula (orange arrow). * shows internal sphincter; # shows external sphincter. FS T2WI: fat suppression T2 weighted imaging.