A 29-year-old woman was seen at our hospital because of a 6-month history of abdominal pain. The pain gradually increased in intensity for these months. Abdominal ultrasonography and contrastenhanced computed tomography showed intussusception caused by a cecal tumor. Colonoscopy revealed type 1 cecal cancer encircling the bowel and we could not pass the scope through the lumen. Gastrograffin enema showed a mass like a crab claw from the cecum to the ascending colon. Pathological examination of

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... he biopsied specimen revealed well differentiated adenocarcinoma. We made the diagnosis of intussusception caused by the cecal carcinoma and conducted right hemicolectomy with D3 dissection. At laparotomy, we saw that the cecal tumor had prolapsed into the lumen of the ascending colon. The resected specimen involved an 85×60mm tumor in the cecum. The final histological diagnosis was well differentiated adenocarcinoma, se, n2, StageⅢb (Japanese Classification of Colorectal Carcinoma, the 7 Edition). The patient has been free from recurrence as of one year after the operation. We reviewed 21 cases of colorectal cancer presented with intussusception in younger people reported in the Japanese literature, including the present case.