Anal fistula ultrasound

Anal fistula Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Manpreet Kaur, MD [2]

Ultrasound

Endoanal ultrasound is cheaper but radiologist dependent modality.

• It is used to know details of fistula anatomy, tracks, and the spinchters.
• Endoanal ultrasound is also used intraoperatively to give surgeons more information at the time of examination with anesthesia.
• Accuracy of endoanal ultrasound can be improved by injection of hydrogen peroxide into fistula tracks.
• Ultrasound has a limited use because probe can go 2cm from the anus so it is poor at evaluating pathology beyond the sphincters (both laterally and above).