rectum prolapse. two types of proctological disease. human anus

anal anatomy anoscopy anus banding body bowel colon crosssection diagram digestive disease disorder drop external flat harmful hemorrhoidopexy hemorrhoidoplasty hemorrhoids human illness infection inflammation internal intestinal intestine medical mucosectomy pain perianal piles proctological proctologist proctology proctoscopy prolapse prolapsed rectal rectum skin sphincter stages swollen system technique thrombosed tract vector