Colonic intussusception caused by anisakiasis: a case report and review of the literature.

A 67-year-old woman presented with periumbilical pain. Contrast-enhanced computed tomography findings indicated intussusception of the ascending colon without ischemia or necrosis, and we performed successful colonoscopy to treat the condition. Furthermore, an edematous area caused by anisakis was detected in the ascending colon and the anisakis was removed. The patient noted that she had eaten raw fish one day before the symptoms developed. Although colonic intussusception caused by anisakiasis is extremely rare, colonoscopy should be performed in colonic intussusception patients suspected of having anisakiasis in order to avoid invasive resection.