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- a right perianal thick-walled trans-sphincteric fistulous tract about 9 cm long is seen with its opening of about 5 o'clock. The fistulous tract ascends upwards and then curved medially to pierce the the external and internal anal sphincters to open within the posterior wall of the anal canal.
- mild local peri-anal sepsis with enhancing inflammatory tissue is seen around the fistulous tract with local inflammatory changes of the right ischioanal and ischiorectal fossae.
- intact levator ani and pelvic floor muscles.