An<unk>  is a situation in which a part of the intestine has prolapsed into another section of intestine, similar to the way in which the parts of a collapsible telescope slide into one another. The part which prolapses into the other is called the intussusceptum, and the part which receives it is called the intussuscipiens. The most frequent type of<unk>  is one in which the ileum enters the cecum, however other types are known to occur, such as when a part of the ileum or jejunum prolapses into itself. Almost all<unk> s occur with the intussusceptum having been located proximally to the intussuscipiens. The reason for this is that peristaltic action of the intestine pulls the proximal segment into the distal segment. There are, however, rare reports of the opposite being true.<unk>  in humans is almost exclusively a disease of the young, usually those between 2 months and 36 months old. This may be a result of its link with certain childhood vaccinations. The CDC through the Federal Government of the United States through the National Vaccine Injury Compensation Program provides compensation for individuals who suffer<unk>  as a result of their reaction to vaccines that contain "live, oral, rhesus-based rotavirus."<unk>  occurs more frequently in boys than in girls, with a ratio of approximately 3:1.
In adults,<unk>  represents the cause of approximately 1% of bowel obstructions and is frequently associated with neoplasm, malignant or otherwise.
Intussusception
Meckel's diverticulum
Pseudomembranous enterocolitis
Hiatus hernia
Gum disease
Vesicointestinal fistula
Enterocele
Duodenal diverticulum