[A Case of Colon Neuroendocrine Carcinoma Believed to Be a Recurrence of Appendiceal Adenocarcinoma].

Neuroendocrine carcinomas in the right-side colon are rare. We report a case of neuroendocrine carcinoma occurring in the anastomotic site after ileocecal resection. The patient was a 55-year-old man who underwent ileocecal resection for adenocarcinoma in his appendix. Following surgery, he was administered adjuvant chemotherapy. Two and a half years after the surgery, he was diagnosedwith left ilium bone metastasis andreceivedrad iotherapy. After the radiotherapy, an anastomotic tumor andperitoneal metastasis were found. He was administeredFOLFIRI but couldnot tolerate the therapy. After changing to FOLFOX therapy, he reportedabd ominal pain from perforation of the anastomotic tumor, which was not improvedby antibiotics. Therefore, he was referredto our hospital for surgery. The surgery includedresection of part of the anastomosis. Histopathological examination showed that the tumor at the anastomosis was not adenocarcinoma but rather neuroendocrine carcinoma. After discharge, the patient started a new chemotherapy regimen(CDDP plus VP-16). This case indicates that resection of the recurrence site may leadto new treatment, improve patient' QOL, andextendthe life prognosis.