Intussusception of the appendix.
D000006:Abdomen, Acute / Q000209:etiology; D001065:Appendix; D002429:Cecal Diseases / Q000209:etiology; D002648:Child; D003108:Colonic Diseases / Q000209:etiology; D006801:Humans; D007443:Intussusception / Q000150:complications / Q000000981:diagnostic imaging*; D008297:Male; D011859:Radiography; D013997:Time Factors