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A high signal track extends superiorly from the left anal margin, just outside the sphincter complex. It penetrates the left lateral aspect of the sphincters and communicates with a horseshoe shaped posterior intersphincteric space collection. There is a track from the right side of this collection into the upper anal canal/low rectum at the 7 o'clock position. There is no deep pelvic or ischioanal fossa collection. The findings are of a trans-sphincteric fistula track with secondary branching and an intersphincteric space collection.