- Invaginating portion of the intestine (intussusceptum) invaginates into the receiving portion of the intestine (intussuscipiens).
- Common cause of childhood intestinal obstruction.
- A seasonal variation exists in some groups with a higher incidence in fall and spring
- It occurs more frequently in males than in females.
- Intussusception typically occurs in children aged 6 months to 2 years.
- In neonates or in children older than 2 years, intussusception has a high incidence of associated bowel abnormality that serves as an initiating lead point.
- Transient intussusceptions are sometimes identified and generally have no real clinical significance. These shoud be distinguished from more severe forms requiring surgical treatment.
- Example of lead points
 Imaging Findings
 Plain film
- May be normal
- Dilated small bowel and absence of gas in the region of the cecum.
- Occasionally, a mass impression within the colonic gas indicates an intraluminal mass created by the intussuscepting loop
Patient #1: 65 y/o male with intermittent abdominal pain
Patient #3: Colocolonic intussesception with a polyp as a lead point in a patient with Peutz-Jeghers syndrome