Types 1 (Intussusception)

anus_4a_n.jpg and anus_4b_n.jpg: Drawings of pathoanatomical types of intussusception (M. Bettex). Depicted are the terminal ileum, the ileocecal region with appendix, and ascending colon. anus_4a_n.jpg: Top: The proximally situated ileum is invaginated into the terminal ileum. Most of the invaginations start in the small intestine. An isolated ileoileal or jejunojenual intussusception is observed postoperatively, spontaneously during laparotomies, and probably in invaginations with spontaneous reduction. Bottom: The invaginated ileum reaches the ascending colon. Appendix and cecum are also involved in the invagination. $$anus_01??££The ileocecal invagination§§ is together with the ileocolic intussusception the most frequently observed type in the clinical everyday work. anus_4b_n.jpg: At the top: The invaginated ileum reaches the ascending colon. Appendix and cecum are not involved in the intussusception. The ileocolic invagination leaves the appendix and the cecum untouched; therefore, in a contrast enema the appendix may be visible. This may lead the unskilled examiner to exclude an invagination. Bottom: The invagination is overlapped by one or more additional intussusceptions. A double or multiple invagination is very rare.