A Case of Complete Intussusception of Adenocarcinoma of the Appendix

Abstract

A 69-year-old man was referred to our hospital to investigate the cause of a positive fecal occult blood test. He was found to have a 40-mm, type 1 tumor in the cecum on colonoscopy. The tumor was diagnosed as malignant on pathological examination of the biopsy specimen. Contrast-enhanced computed tomography (CT) showed a mass lesion of the cecum overlapping the ascending colon. Intussusception due to cecal cancer was suspected, and laparoscopic ileocecal resection with lymph node dissection was performed. In the resected specimen, the appendix was completely inverted in the cecum, and a tumor was found at the tip of the appendix. The pathological diagnosis was advanced appendiceal cancer that infiltrated beyond the muscularis propria. A very rare case of complete appendiceal intussusception due to advanced appendix cancer is presented.