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An anal fistula is a tunnel that runs from inside the anus-- the hole your body uses to get rid of solid waste -- to somewhere in the skin around it. Diagnosis is by examination, either in an outpatient setting or under anaesthesia (referred to as eua or examination under anaesthesia). The fistula may be explored by using a fistula probe (a narrow instrument). Diagnosis may be aided by performing a fistulogram, proctoscopy andor sigmoidoscopy. Anal fistulas can cause unpleasant symptoms, such as discomfort and skin irritation, and will not usually get better on their own. Anal fistula is the medical term for an infected tunnel that develops between the skin and the muscular opening at the end of the digestive tract (anus). Learn about the small tunnels in the skin known as anal fistulas from cleveland clinic. Get information on the symptoms of anal fistulas, how they are diagnosed, and the surgeries used to repair them. If youre dealing with one or more fistulas, youll surely want them to be gone. Ive put together a basic guide to anal fistulas to help you understand this difficult condition and what options are available. A fistula is an abnormal connection between two hollow spaces (technically, two epithelialized surfaces), such as blood vessels, intestines, or other hollow organs. Fistulas are usually caused by injury or surgery, but they can also result from an infection or inflammation. Fistulas are generally a disease condition, but they may be surgically created for therapeutic reasons. Anal fistulas new perspectives on treatment and pathogenesis the work presented in this thesis was conducted at the department of immunol-ogy, and the department of surgery of the erasmus medical center, rotterdam, the netherlands. Printing of this thesis was financially supported by erasmus university rotterdam. position of the mucosal opening on axial images (using the anal clock). Distance of the mucosal defect to the perianal skin on coronal images. The drawing on the left illustrates the anal clock, which is the surgeons view of the perianal region when the patient is in the supine lithotomy position (2). An anal fistula (also commonly called fistula-in-ano) is frequently the result of a previous or current anal abscess. The fistula is the tunnel that forms under the skin and connects the clogged infected glands to an abscess.