What examinations should be performed for perianal abscesses?

1. Anal ultrasound (AUS) examination: For complex perianal purulent diseases, abscesses that cannot be identified clinically, anal ultrasound examination can be used to help determine the anatomical relationship between abscesses, fistulas and sphincter, and occasionally identify the internal mouth.

2. Rectal digital examination: Local tenderness and wave sensation in the abscess.

3. Puncture aspiration.

4. Defecography: can display the location, quantity, depth, size, shape, and direction of abscesses and fistulas.