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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. Anal fistulas can cause unpleasant symptoms, such as discomfort and skin irritation, and will not usually get better on their own. Anal fistula is a chronic abnormal communication between the epithelialised surface of the anal canal and usually the perianal skin. An anal fistula can be described as a narrow tunnel with its internal opening in the anal canal and its external opening in the skin near the anus. Anal fistulae commonly occur in people with a history of anal abscesses. Perianal fistula (or fistula-in-ano) (plural fistulae or fistulas) is the presence of a fistulous tract acrossbetweenadjacent to the anal sphincters and is usually an inflammatory condition 4. 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). Anal fistulas are classified according to their progression relative to the anal sphincter and pelvic floor structures. To characterize a perianal fistula, it is essential to adequately describe the point of origin in the anal canal and the path of the fistula with respect to the pelvic anatomic boundaries. Perianal fistulas are tunnel-like formations in the skin and deeper tissues that surround the anal area of dogs. The lesions vary in severity but at first appear as small oozing holes in the skin. These holes may become wide and deep and surround the entire circumference of the anus. Perianal fistula, also known as anal furunculosis is a serious medical condition that most commonly affects german shepherd dogs. Perianal fistulas are characterized by chronic, purulent, smelly, ulcerating, sinus tracts in the anal region and surrounding skin. More recent studies indicate that the condition is more likely caused by an autoimmune disease. Anal fistula what is an anal fistula? An anal fistula is a small tunnel that connects an abscess, an infected cavity in the anus, to an opening on the skin around the anus. The anus is the external opening through which feces are expelled from the body.