Intussusception of the appendix in children.

Intussusception of the appendix is uncommon and an unusual cause of ileocolic intussusception. The pediatric age group is most often affected. Appendiceal intussusception may present as primary appendiceal invagination but more commonly leads to secondary intussusception. Two cases of partial appendiceal intussusception leading to secondary intussusception are presented. Classification, symptomatology, radiographic appearance, and differential diagnosis are discussed.