Duodenal and Ampulla of Vater Neuroendocrine Tumor pT1 TNM Finding v9

**Semantic type:** Finding

**Definition:** For duodenum neuroendocrine tumor: Tumor invades the mucosa or submucosa only and is equal to or less than1 cm in greatest dimension. For ampulla of Vater neuroendocrine tumor: Tumor is equal to or less than 1 cm in greatest dimension and is confined within the sphincter of Oddi. (from AJCC 9th Ed.)

**Synonyms:** - Duodenum and Ampulla of Vater Neuroendocrine Tumor pT1 TNM Finding v9