A fistula is an abnormal tunnel or connection that forms between two parts of the body that aren’t normally connected. For example, an anal fistula connects the anus or rectum to the skin near the anus, often due to infection.
The most common cause of anal fistulas is an infection in the anal glands that leads to an abscess. The infection can spread, creating a tunnel or fistula.
Conditions like Crohn’s disease, which causes inflammation in the intestines, can lead to fistulas in the digestive tract.
In some cases, an injury or previous surgery near the anus, such as a haemorrhoidectomy, can result in the formation of a fistula.
Though less common, cancer can sometimes cause abnormal tissue growth that leads to fistulas.
Certain diseases, such as tuberculosis or sexually transmitted infections (STIs), can also contribute to the development of fistulas.
Conservative (Non-Surgical) Treatment
Your doctor will inspect the anal area for any visible signs of an abscess, swelling, or openings.
In some cases, a small instrument called an anoscope may be used to look inside the anus and rectum for any abnormal connections or tunnels.
Your doctor may use imaging techniques like an ultrasound, MRI, or CT scan to get a clearer view of the fistula and determine its size and location.
This is a special procedure where a contrast dye is injected into the fistula to make it visible on X-ray images.
In a fistulotomy, the surgeon cuts open the fistula along its entire length, allowing it to heal from the inside out. The surgeon drains pus or infection from the fistula, and then makes a small incision to open the tunnel, allowing tissue to heal gradually over time.
A seton is a type of surgical thread or material that is placed through the fistula to help it drain and keep the fistula open while it heals. A seton is used in complex fistulas near anal sphincter muscles to keep the fistula open and encourage healing by encouraging the body to form new tissue.
A fistulectomy involves the complete removal of the fistula, including the surrounding tissue.
This surgery is often used for complex fistulas or those near the anal sphincter, which is the muscle controlling bowel movements.
LIFT surgery is a newer technique used for treating certain types of fistulas, especially those that are low in the anal canal.
Anal fistulas generally do not heal on their own and typically require surgery.
Without proper treatment, anal fistulas can lead to complications such as:
Yes, anal fistulas can recur after surgery, particularly if they are complex or involve significant portions of the anal sphincter muscle. However, with proper surgical treatment, the recurrence rate is generally low. Following your doctor’s post-operative care instructions (such as keeping the area clean, avoiding constipation, and attending follow-up appointments) can help reduce the risk of recurrence.
It's recommended to avoid sexual activity involving the anal region until the fistula is fully healed, as friction and pressure may exacerbate symptoms or cause further damage.
After surgery for an anal fistula, it’s important to: