Hindgut Neuroendocrine Tumor G3

**Semantic type:** Neoplastic Process

**Definition:** A well-differentiated, high-grade neuroendocrine neoplasm that arises from the sigmoid colon, descending colon, or rectum. The mitotic count is more than 20 per 2 mm2 and/or the Ki-67 index is more than 20%.

**Synonyms:** - Hindgut NET G3