Illustration of intussusception

Illustration of intussusception in a child. In ileocolic intussusception, the ileum invaginates (telescopes) through the ileocecal junction into the colon. This is the most common form, accounting for approximately 90% of all cases. Other types of intussusception are ileo-ileal, ileo-ileo-colic, jejuno-jejunal, jejuno-ileal, or colo-colic. A pathologic lead point is identified in a minority of cases (as shown in the illustration of ileo-ileal intussusception above).