What is Anal Fistula?
An anal fistula is usually caused by an infection near your back passage (anus) that causes a collection of pus (abscess) in the nearby tissue. When the pus drains away, it can leave a small channel (fistula) behind. An anal fistula may also be associated with certain long-term bowel conditions.
An anal fistula is an abnormal small channel (also called the fistula tract) that develops between the end of the bowel and the skin near your back-passage (anus). . It typically develops as a result of an infection or an abscess (a collection of pus) in the anal glands, which are small glands located near the anus.
What are the Types of Anal Fistula?
There are several types of anal fistulas, which are classified based on their location and severity.
Extrasphincteric Fistula:Extrasphincteric anal fistula extends beyond the external sphincter muscle and is usually caused by a chronic infection.
Intersphincteric Fistula: It is located between the internal and external sphincter muscles of the anus. It is the most common type of anal fistula and is usually caused by an infected anal gland.
Transsphincteric Fistula: It extends through both the internal and external sphincter muscles of the anus. It is usually caused by an infection that spreads from an abscess.
Suprasphincteric Fistula:Suprasphincteric anal fistula extends above the internal sphincter muscle and is usually caused by an infection that spreads from an abscess.
