Perianal fistula - etiology, clinical features, Goodsall rule, surgery

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A perianal fistula (fistula-in-ano) refers to an abnormal connection between the anal canal and the perianal skin.

The majority are associated with anorectal abscess formation, with one third of patients with an anorectal abscess having an associated perianal fistula at the time of presentation.

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