Presentation
Pus discharge from the anus
Patient Data













Hyperintense fistulous tract extends in the left ischioanal & ischiorectal fossa for about 7 cm, it traverses the external anal sphincter opposite 3 O'clock arching over the puborectalis and below the levator ani muscle, to end in a horseshoe posterior intersphincteric collection measuring 3.0 cm, no side branches noted.
Opinion:
High trans-sphincteric fistula with horseshoe intersphincteric abscess.
Case Discussion
Controversy in the diagnosis of this case between "Suprasphincteric" & "High Trans-sphincteric" fistula,
It's usually difficult radiologically to differentiate suprasphincteric fistula from a high transsphincteric fistula. In any event, there is little difference in practical terms because surgical management is similar.