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See also:FISTULA (See also:Lat. for a See also:pipe or See also:tube) , a See also:term in See also:surgery used to designate an abnormal communication leading either from the See also:surface of the See also:body to a normal cavity or See also:canal, or from one normal cavity or canal to another . These communications are the result of disease or injury . They receive different names according to their situation: lachrymal See also:fistula is the small opening See also:left after the bursting of an See also:abscess in the upper See also:part of the See also:tear-duct, near the See also:root of the See also:nose; salivary fistula is an opening into the salivary duct on the cheek; anal fistula, or fistula in ano, is a suppurating track near the outlet of the bowel; urethral fistula is the result of a giving way of the tissues behind a stricture . These are examples of the variety of the first See also:kind of fistula; while recto-vesical fistula, a communication between the rectum and See also:bladder, and vesico-vaginal fistula, a communication between the bladder and vagina, are examples of the second . The abnormal passage may be straight or tortuous, of considerable See also:diameter or of narrow calibre . Fistulae may be caused by an obstruction of the normal channel, the resultof disease or injury, which prevents, for example, the tears, saliva or urine, as the See also:case may be, from escaping; their retention gives rise to inflammation and ulceration in See also:order that an exit may be obtained by the formation of an abscess, which bursts, for example, into the gut or through the skin; the cavity does not See also:close, and a fistula is the result . The fistulous channel remains open as See also:long as the contents of the cavity or canal with which it is connected can pass through it . To obliterate the fistula one must remove the obstruction and encourage the flow along the natural channel; for example, one must open up the nasal duct so as to allow the tears to reach the nasal cavity, and the lachrymal fistula will close; and so also in the salivary and urethral fistulae . Sometimes it may be necessary to See also:lay the channel freely open, to scrape out the unhealthy material which lines the track, and to encourage it to fill up from its deepest part, as in anal fistula; in other cases it may be necessary to See also:pare the edges of the abnormal opening and stitch them together . (E . |
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