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49 year-old male with prior perirectal abscess presenting with a Grade 3 (simple transphincteric) perianal fistula. The fistula would also be a transphincteric fistula in the Parks’ classification system.
Axial T2W fat saturated image (4250/107) of the lower pelvis shows a simple transphincteric fistula arising from the right aspect of the superior anal canal (arrow) violating the external sphincter (arrowheads). Prostate (*).
