. Diseases of the rectum and anus: designed for students and practitioners of medicine. Fig. 62.—Unusual Types of BlindInternal Bistula. Fig 63.—Common Types of BlindInternal Fistula. as compiled by Cooper and Edwards, 8497, or a little morethan 50 per cent., were treated for fistula in ano in some these, 5829 were men, and 2668 women. This is about theusual percentage as regards sex. The author in his work hasnot found that fistula occurs as frequently as all other rectaldiseases combined. In dispensary practice he has observed 236 DISEASES OF THE RECTUM AND ANUS that about one person
. Diseases of the rectum and anus: designed for students and practitioners of medicine. Fig. 62.—Unusual Types of BlindInternal Bistula. Fig 63.—Common Types of BlindInternal Fistula. as compiled by Cooper and Edwards, 8497, or a little morethan 50 per cent., were treated for fistula in ano in some these, 5829 were men, and 2668 women. This is about theusual percentage as regards sex. The author in his work hasnot found that fistula occurs as frequently as all other rectaldiseases combined. In dispensary practice he has observed 236 DISEASES OF THE RECTUM AND ANUS that about one person in three has fistula. The proportion offistulas to other diseases is not so great in the upper circlesof society. This is probably due to the fact that their occu-pations are not so arduous, they are not exposed to inclementweather, and do not live in densely-populated districts wheretuberculosis is common. ETIOLOGY AND PATHOLOGY The etiology and pathology of periproctitis and abscessdo not differ in the main from those of fistula in ano, because. Fig. Si.—A, Blind External Fistula; B, Complete Internal Fistula. the latter is invariably secondary to the former. An abscesswhich has been opened or allowed to rupture seldom healsspontaneously. On the contrary, it gradually shrinks up anddegenerates into the ordinary fistulous tract. There are sev-eral reasons why perirectal abscesses do not get well: (a) restis impossible owing to the acts of defecation and micturitionand the activity of the sphincters; (b) the venous circulationin this region is sluggish by virtue of the upright position as-sumed by man and the lack of proper support to the veins ofthis region; (c) the entrance of foul gases and feces into the ANORECTAL FISTULA 237 abscess-cavity when an opening into the rectum exists; (d)retention of pus when the openings are small; (e) when dueto local tuberculosis the destructive process is prone ratherto extend than to heal. Except when due to a pre-existing rectal dis
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanusdis, bookyear1910
