<prompt> Treatment of choice for low fistula in ano is -FistulotomyIntravenous antibioticsStaged surgical resectionNone of the above  <response>: Ans. is a i.e. Fistulotomy A fistula in ano is a track, lined by granulation tissue, that connects deeply in the anal canal or rectum and superficially on the skin around the anus. It usually results from an anorectal abscess cryptoglandular abscess Other causes are: Crohns ds., malignancy, radiation, tuberculosis, actinomycosis, chalamydia inf It is divided into 2 types - high low, according to whether their internal openings is below or above the anorectal ring. The importance of deciding whether a fistula is a low or a high type is that a low level can be treated by fistulotomy opening the tract without causing damage to the sphincter. High level fistulas can be treated only by staged operation as there is risk of incontinence. 