Perianal fistula: trans-sphincteric

Case contributed by Dr Mostafa Mahmoud El Feky


Perianal inflammation.

Patient Data

Age: 40
Gender: Male

MRI perianal fistula

Left sided trans-sphincteric active fistulous tract is seen, showing mucosal anal opening at 2 O'clock position, located 1 cm from the anal verge.

Course: Trans-sphincteric to the low ischioanal fat on the left. Cutaneous opening on the left side of the natal cleft. No side branches or abscesses.

Intact levator ani, with no supralevator collections identified.

Case Discussion

MRI is the modality of choice to identify the type and course of perianal fistula. It differentiates active from chronic fistula as well as detection and localization of abcesses and side branches.

According to St James classifications, this fistula is considered grade 3 (trans-sphincteric).

PlayAdd to Share

Case information

rID: 52886
Published: 28th Apr 2017
Last edited: 2nd May 2017
Inclusion in quiz mode: Included

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.