Practical Gastroenterology and Hepatology Board Review Toolkit

Nicholas J. Talley , Kenneth R. Devault, Michael B. Wallace, Bashar A. Aqel, Keith D. Lindor


41.1 Endoscopic ultrasound for fistula

This is an example of the utility of EUS to evaluate perianal fistulae. One will see an obvious trans-sphincteric fistula anteriorly. The fistula appears as a hypoechoic tract with hyperechoic beads within. This represents inflammation in the tract and air within the fistula.