Endoanal ultrasound used to know details of fistula anatomy, tracks, and the spinchters.This is used intraoperatively by surgeons to have better information of fistula. Accuracy of endoanal ultrasound is improved by injection of hydrogen peroxide into fistula tracks. Ultrasound has a limited use because probe can go 2 cm from the anus so it is poor at evaluating pathology beyond the sphincters.
Anal fistula ultrasound
Anal fistula x ray
Perianal abscess ultrasound
Anal fistula physical examination
Perianal abscess CT
Anal fissure physical examination
Diverticulitis ultrasound
Constipation ultrasound