. Gynecology : . FISTULA IN ANO Anal fistulas may be the outcome of previous ischiorectal or perirectalabscesses. The origin is commonly from an infected hemorrhoid. Neglectedabscesses and those that rupture spon- ,.. are usually followed by a per-manent fistula, and even those that re-ceive early surgical treatment are aptto suffer the same fate. The fistulous opening may assumeone of several different forms, accordingto the position of its outlet. The fistula is said to be completewhen it opens both inward toward thebowel and outward on the skin; it issaid to be incomplete where
. Gynecology : . FISTULA IN ANO Anal fistulas may be the outcome of previous ischiorectal or perirectalabscesses. The origin is commonly from an infected hemorrhoid. Neglectedabscesses and those that rupture spon- ,.. are usually followed by a per-manent fistula, and even those that re-ceive early surgical treatment are aptto suffer the same fate. The fistulous opening may assumeone of several different forms, accordingto the position of its outlet. The fistula is said to be completewhen it opens both inward toward thebowel and outward on the skin; it issaid to be incomplete where there is onlyone opening, and this opening may leadeither inward or outward, the other endof the fistula being blind. The outeropening is usually within one or twoinches of the anus, but it may be furtheraway, sometimes even appearing at orinside the perineal outlet. The insideopening is in most cases just within theanal margin between the upper andlower borders of the sphincter may, however, be situate
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