Rectal Neuroendocrine Tumor by AJCC v9 Stage

**Semantic type:** Neoplastic Process

**Definition:** A term that refers to the staging of rectal neuroendocrine tumor, based on the American Joint Committee on Cancer (AJCC) v9 staging guidelines. This staging system applies only to well-differentiated neuroendocrine tumors of the rectum (NET G1, G2, and G3). It does not apply to poorly differentiated neuroendocrine carcinomas and mixed neuroendocrine-non-neuroendocrine neoplasms (formerly mixed adenoneuroendocrine carcinomas) of the rectum. (from AJCC 9th Ed.)