Colon Small Cell Neuroendocrine Carcinoma

**Semantic type:** Neoplastic Process

**Definition:** An aggressive high-grade carcinoma with neuroendocrine differentiation that arises from the colon and is composed of malignant small cells. The mitotic count is more than 20 per 2 mm2 and/or the Ki-67 index is more than 20%.

**Synonyms:** - Colon Oat Cell Carcinoma - Colon Small Cell Carcinoma - Colon Small Cell Neuroendocrine Cancer - Colonic Oat Cell Carcinoma - Colonic Small Cell Carcinoma - Oat Cell Carcinoma of Colon - Oat Cell Carcinoma of the Colon - Oat Cell Colon Carcinoma - Small Cell Carcinoma of Colon - Small Cell Carcinoma of the Colon - Small Cell Colon Carcinoma