Mucosal prolapse (partial rectal mucosal prolapse) refers to prolapse of the loosening of the submucosal attachments to the muscularis propria of the distal rectummucosal layer of the rectal wall. Most sources define mucosal prolapse as an external, segmental prolapse which is easily confused with prolapsed (3rd or 4th degree) hemorrhoids (piles). However, both internal mucosal prolapse (see below) and circumferential mucosal prolapse are described by some. Others do not consider mucosal prolapse a true form of rectal prolapse.Internal mucosal prolapse (rectal internal mucosal prolapse, RIMP) refers to prolapse of the mucosal layer of the rectal wall which does not protrude externally. There is some controversy surrounding this condition as to its relationship with hemorrhoidal disease, or whether it is a separate entity. The term "mucosal hemorrhoidal prolapse" is also used.Solitary rectal ulcer syndrome (SRUS, solitary rectal ulcer, SRU) occurs with internal rectal intussusception and is part of the spectrum of rectal prolapse conditions. It describes ulceration of the rectal lining caused by repeated frictional damage as the internal intussusception is forced into the anal canal during straining. SRUS can be considered a consequence of internal intussusception, which can be demonstrated in 94% of cases. Mucosal prolapse syndrome (MPS) is recognized by some. It includes solitary rectal ulcer syndrome, rectal prolapse, proctitis cystica profunda, and inflammatory polyps. It is classified as a chronic benign inflammatory disorder.
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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". Merriam-Webster Dictionary. 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". 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". "Intussusception". Merriam-Webster Dictionary. 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.