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Rectal prolapse
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Rectal prolapse : ウィキペディア英語版
Rectal prolapse

Used unqualified, the term rectal prolapse often is used synonymously with complete rectal prolapse (external rectal prolapse), where the rectal walls have prolapsed to a degree where they protrude out the anus and are visible outside the body. However, most researchers agree that there are 3 to 5 different types of rectal prolapse, depending on if the prolapsed section is visible externally, and if the full or only partial thickness of the rectal wall is involved.
Rectal prolapse may occur without any symptoms, but depending upon the nature of the prolapse there may be mucous discharge (mucus coming from the anus), rectal bleeding, degrees of fecal incontinence and obstructed defecation symptoms.〔
Rectal prolapse is generally more common in elderly women, although it may occur at any age and in both sexes. It is very rarely life-threatening, but the symptoms can be debilitating if left untreated.〔 Most external prolapse cases can be treated successfully, often with a surgical procedure. Internal prolapses are traditionally harder to treat and surgery may not be suitable for many patients.
==Terminology==

Prolapse refers to "the falling down or slipping of a body part from its usual position or relations". It is derived from the Latin ''pro-'' - "forward" + ''labi'' - "to slide". Prolapse can refer to many different medical conditions other than rectal prolapse.
procidentia has a similar meaning to prolapse, referring to "a sinking or prolapse of an organ or part". It is derived from the Latin ''procidere'' - "to fall forward".〔(【引用サイトリンク】url=http://medical-dictionary.thefreedictionary.com/procidentia )Procidentia usually refers to uterine prolapse, but rectal procidentia can also be a synonym for rectal prolapse.
Intussusception is defined as invagination (infolding), especially referring to "the slipping of a length of intestine into an adjacent portion". It is derived from the Latin ''intus'' - "within" and ''susceptio'' - "action of undertaking", from ''suscipere'' - "to take up". Rectal intussusception is not to be confused with other intussusceptions involving colon or small intestine, which can sometimes be a medical emergency. Rectal intussusception by contrast is not life-threatening.
Intussusceptum refers to the proximal section of rectal wall, which telescopes into the lumen of the distal section of rectum (termed the intussuscipiens).〔 What results is 3 layers of rectal wall overlaid. From the lumen outwards, the first layer is the proximal wall of the intussusceptum, the middle is the wall of the intussusceptum folded back on itself, and the outer is the distal rectal wall, the intussuscipiens.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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