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25 year-old woman with Grade 4 (complex transphincteric) perianal fistula due to prior perirectal abscess.
Post contrast T1W GRE MRI image (6.35/1.53 ms; flip angle 13°) through the lower pelvis and anal canal with rim enhancing abscess (arrow) with a transsphincteric grade 4 fistula penetrating the external sphincter on the left (arrowhead). The vagina (asterisk) is seen anterior to the rectum.
