Low anal fistula examination

It can be seen that the external opening is broken, and those who close the external opening can touch the induration.

touch

It is the simplest and most direct method to diagnose low anal fistula. By touching, we can know the depth, direction and position of the internal fistula. Generally, the low anal fistula can touch the hard cord. When the fistula is compressed, the secretion can overflow from the outer mouth, and the tooth line attached to the inner mouth can touch the induration or depression.

3. Anoscopy

Mainly observe whether there is congestion, depression and pus in anal recess. During the treatment, the probe can be used to check the position of the internal orifice.

4. Dyeing inspection

Put a piece of dry gauze in the anus and inject methylene blue solution from the outside. If the inner opening is not closed, the gauze will be colored to help find the position of the inner opening.

5. Image inspection

Intraanal ultrasound and magnetic resonance imaging are generally less used for low anal fistula, but they have certain diagnostic value for complex low anal fistula.