The anus is an external opening through which faeces is expelled out of your body. There are a number of small glands inside the anus. These glands may sometimes get blocked and form an infected cavity called an abscess. Often, anal abscesses further develop into an anal fistula. An anal fistula is a small channel or tunnel that develops from the infected gland and opens out onto the skin near the anus.
Some fistulae have only one opening, while others are branched out into many openings. Fistulae may sometimes be connected to the sphincter muscles, the muscles that open and close the anus. The ends of the fistulae look like holes on the surface of the skin around the anus. Anal fistulas are commonly treated through surgery.
Signs and Symptoms
The commonly observed symptoms of an anal fistula include:
Your doctor may review your medical history and conduct a physical examination to find the opening of the fistula. This will help your doctor trace the path of the channel, which can usually be felt as a hard cord-like structure below the skin. A digital rectal examination (insertion of a gloved finger through your anus) may be performed to find the internal opening of the fistula, the presence of any branching and the functioning of the sphincter muscles. Further examinations may be performed with the use of a fistula probe (a tiny instrument inserted into the rectum) and a proctoscope (a lighted device). Your doctor may recommend an ultrasound, CT or MRI scan for complicated fistulae with many branches, to evaluate the exact position of the fistula channels.
Fibrin glue is the only non-surgical procedure for the treatment of an anal fistula. The fibrin glue is injected through the opening of the fistula and the opening is closed with stitches. Surgery is suggested when this does not relieve the symptoms of the fistula.
As part of the pre-surgical process, you will be advised to stop smoking, fast for about 6 hours before the surgery, and you will be given an enema an hour before the surgery to empty your lower bowel. Anal fistula surgery is performed under general anaesthesia. The type of operation depends on the position of the fistula.
After the surgical procedure, your doctor will discharge you from the hospital on the same day or after a few days based on your condition. It might take 6 weeks for the wound to heal completely. The doctor may prescribe painkillers, antibiotics and laxatives. You will be advised to carefully wash, clean and dry your anal area. You are advised not to sit for long periods and walk much until healing occurs.
Risks and Complications
Anal fistula surgery is generally safe with no major risks. However, like most surgeries, anal fistula surgeries may involve complications such as:
Your doctor will assess your condition with utmost detail and recommend the best treatment option.