Intussusception entities

Intussusception is a medical condition in which a part of the intestine folds into the section immediately ahead of it.
It typically involves the small bowel and less commonly Colon.
Symptoms include abdominal pain which may come and go, vomiting, abdominal bloating, and bloody stool.
It often results in a small bowel obstruction.
Other complications may include peritonitis or bowel perforation.
Intussusception is an emergency requiring rapid treatment

Early symptoms can include periodic abdominal pain, nausea, vomiting (sometimes green in color from bile), pulling legs to the chest area, and intermittent moderate to severe cramping abdominal pain.
Pain is intermittent—not because the intussusception temporarily resolves, but because the intussuscepted bowel segment transiently stops contracting.
Later signs include rectal bleeding, often with "red currant jelly" stool, and lethargy.
Physical examination may reveal a "sausage-shaped" mass, felt upon palpating the abdomen.
Children may cry, draw their knees up to their chest, or experience dyspnea with paroxysms of pain.
Neonates it may have bilious vomiting and blood stained stools
In rare cases, intussusception may be a complication of Henoch–Schönlein purpura.

About 90% of cases of intussusception in children arise from an unknown cause. They can include infections, anatomical factors, and altered motility.
While an earlier version of the rotavirus vaccine was linked to intussusception, the current versions are not.
Risk factors in children include certain infections, diseases like cystic fibrosis, and intestinal polyps.
Risk factors in adults include endometriosis, bowel adhesions, and intestinal tumors.

In the most frequent type of intussusception, the ileum enters the cecum. However, other types occur, such as when a part of the ileum or jejunum prolapses into itself.
This is because peristaltic action of the intestine pulls the proximal segment into the distal segment.

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