Perianal discharge for about a year. History of episiotomy one year ago.
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A non-branching hypoechoic tract extends from the perianal skin to anal canal.
Length: about 15-18 mm.
Communicates with anal canal at 11 o'clock.
Communication is about 15-20 mm away from anal orifice.
No abscess or other tract is noted.
Findings of perianal fistula.