Metastatic Large Cell Neuroendocrine Carcinoma of the Colon: A Case Report.

Colorectal neuroendocrine tumors are rare entities, with large cell neuroendocrine carcinomas occurring less frequently. We report a case of an 83-year-old male who presented with symptoms of intestinal obstruction. A computed tomography scan of the abdomen and pelvis revealed a high-grade large bowel obstruction secondary to an irregular exophytic soft tissue mass within the ascending colon, with extensive metastatic disease. He subsequently underwent a right hemicolectomy. Histologic evaluation revealed large cell neuroendocrine carcinoma of the colon. Standardized treatment modalities have not been established; however, chemotherapy is often used as the first-line or adjuvant therapy with surgery. Unfortunately, our patient succumbed to postoperative complications on day 30 of the hospital stay.