Stage II Duodenal and Ampulla of Vater Neuroendocrine Tumor AJCC v9

**Semantic type:** Neoplastic Process

**Definition:** Stage II includes: T2, T3, N0, M0. T2: For duodenum neuroendocrine tumor: Tumor invades the muscularis propria or is more than 1 cm in greatest dimension. For ampulla of Vater neuroendocrine tumor: Tumor invades through sphincter of Oddi into duodenal submucosa or muscularis propria or is more than 1 cm in greatest dimension. T3: Tumor invades the pancreas or peripancreatic adipose tissue. N0: No tumor involvement of regional lymph node(s). M0: No distant metastasis. (AJCC 9th ed.)

**Synonyms:** - Stage II Duodenum and Ampulla of Vater Neuroendocrine Tumor AJCC v9