Is routine endoanal ultrasound useful in anal fistulas?
Endoanal ultrasound with hydrogen peroxide enhancement is an effective examination to visualize fistulous tracts and internal openings. We think it is highly useful for anal or perianal suppuration to identify abscesses, to recognize a perianal sinus, to check the sphincteric condition, and to plan subsequent surgery.
In clinical practice, both Maier and Bech scales can be used as equivalents of the HDRS, but will be more efficient.