Gastric Neuroendocrine Tumor TNM Finding v9

**Semantic type:** Finding

**Definition:** A finding about one or more characteristics of gastric neuroendocrine tumor, following the rules of the TNM AJCC v9 classification system. This classification system applies only to well-differentiated neuroendocrine tumors of the stomach (NET G1, G2, and G3). It does not apply to carcinoma of the stomach including neuroendocrine carcinoma (NEC), mixed adenocarcinoma-NEC and mixed adenocarcinoma-NET. (from AJCC 9th Ed.)