An anal fistula is an abnormal passageway that develops from inside your anus to the skin outside. It usually develops in the upper part of your anus (butthole), where your anal glands are. When these glands become infected, drainage from the infection can create a fistula. This infection is called a perianal abscess. (Sometimes an anal fistula is also called a perianal fistula. “Perianal” means in the region of your anus.)
The most common anal fistula symptoms are:
Less common symptoms include:
You may or may not be able to see the fistula with a mirror.
An anal fistula looks like a hole in the skin near your anus. The hole is actually the outermost portion of the tunnel, which connects to the abscess inside. It might ooze drainage, like pus, blood or poop, especially when you touch the skin around it. Some older fistulas may close at the opening, while the rest of the tunnel remains. This causes pain and swelling until the fistula reopens to let out the drainage.
Fistulas can occur throughout your body, either between different organs or from an organ to an opening in your skin. They usually occur when your tissues are inflamed for a long time, due to an injury or disease. Chronic inflammation and infection can eventually erode into the nearby tissues, especially when pus needs to drain. This can create a channel between the wound and nearby tissues.
The most common cause of an anal fistula is a perianal abscess, which usually forms over an infected anal gland. An abscess is a pocket of pus that develops at the site of an infection. The pus needs to drain away and may create its own drainage channel to the outside Sometimes, a healthcare provider creates a drainage channel to treat the abscess. But often, the wound doesn’t heal completely, leaving a fistula. Uncommon causes of anal fistulas include:
A fistula that goes untreated generally won’t heal on its own. This can lead to long-term complications, such as:
Healthcare providers can find most anal fistulas during a physical exam, but sometimes the opening to the outside is closed. Your provider will also want to find the inside opening to the fistula, within your anus. This part might require anesthesia. If it hurts too much for your provider to touch or open your anus to examine the inside, they may have to examine you in the operating room under sedation.
To find the inside source of the fistula, your provider may use a lighted scope, like an anoscope or proctoscope (a longer scope that can visualize your rectum). Sometimes, they’ll inject hydrogen peroxide into the external opening to find the infection at the source of the fistula. The peroxide will interact with the infection and create bubbles or foam at the site. Finding the inside source can confirm the fistula.
Healthcare providers classify anal fistulas by where they’re located in relation to your anal sphincter muscles. These are the muscles that control your bowel movements, so it’s important to protect them. Your provider might refer to your anal fistula by a specific name based on its location, such as:
You don’t have to know or remember what type of anal fistula you have, but the type will influence how your provider treats it. If it involves much of your sphincter muscles, the treatment might be more complicated. They have to be careful not to injure these muscles when they fix your anal fistula.
Most anal fistulas will require surgery to fix. Spontaneous healing is usually followed by recurring infections and abscesses that reopen the fistula. However, if your fistula is caused by inflammatory bowel disease and isn’t infected, it’ll occasionally heal with medical treatment. Your provider might try treatment with an immunomodulator, like infliximab, before resorting to surgery for these fistulas.
Anal fistula surgery can be simple or complex, depending on how simple or complex the fistula is. The most common anal fistulas are simple, intersphincteric fistulas, which only involve a small amount of muscle. These are safe to treat in a single operation. More complex fistulas may need surgery in stages.
If your anal fistula involves only a minimal amount of muscle and doesn’t have any branches, it’s considered a simple fistula. The surgical treatment for a simple fistula is called a fistulotomy. This one-and-done procedure is the easiest and the most effective way to treat an anal fistula (about 95%).
Fistulotomy: Your colorectal surgeon will cut through the roof of the fistula, allowing it to fill in from the bottom up. They might also remove infected tissue. Cutting through the roof may mean cutting through a small amount of muscle, but a little is OK. Cutting too much muscle risks damaging your bowel control.
Your fistula is considered complex if it involves a significant amount of muscle, if it has branches or if you have preexisting conditions that raise your risk of complications from surgery. Complex fistulas may require multiple surgeries to fix. Your colorectal surgeon may use one or more of these techniques:
The main risks are:
Copyright © 2023 NabSol
WhatsApp us