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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. Blind fistula this type of anal fistula is open only at one end but connects two structures. Complete fistula this anal fistula has both, an internal & external opening. Horseshoe fistula this type of anal fistula connects anal canal to surface of skin near anus after going around the rectum. An anorectal fistula is an abnormal connection between the anus and the skin around it. The anus is the external opening of the digestive tract through which the food wastes are expelled from the body. Commonly, an anal fistula arises from an anal abscess, infected cavity filled with pus. For practical purposes, anal fistula are 2 types- low & high. Low fistula are present in the lower part and do not extend up to the ano-rectal sling muscle layer responsible for continence (control on passage of motions). Knowing the type of fistula is important because high fistula if not managed properly can be associated with incontinence. suprasphincteric - through the anal crypt and encircling the entire sphincter, ending in the ischiorectal fossa extrasphincteric - starting high in the anal canal, encompassing the entire sphincter. anal fistula types anal fistulas are classified into many types based on its location with respect to the surrounding structures of the anus. Some of them include peri-anal, intersphicteric fistula and ischio-anal fistula. Different types of anal fistulas are classified by their location. In order of most common to least common, the various types include intersphincteric fistula. The tract begins in the space between the internal and external sphincter muscles and opens very close to the anal opening. The most widely used classification is the parks classification which distinguishes four kinds of fistula intersphincteric, transsphincteric, suprasphincteric and extrasphincteric. The most common fistulas are the intersphincteric and the transsphincteric.