Perianal fistula: complex
History of complex anal fistula not resolving
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Tract extends superiorly within the ischioanal fat on the left side, involving the puborectalis muscle. At the level of the anal sphincter at 3 c'clock there is a further tract which penetrates the external sphincter and and extends toward the 6 c'clock position.
Acquired on 1.5T Toshiba Titan.