Stage III Ampulla of Vater Neuroendocrine Tumor AJCC v9

**Semantic type:** Neoplastic Process

**Definition:** Stage III includes: (T4, N0, M0); (Any T, N1, M0). T4: Tumor invades the visceral peritoneum (serosa) or other organs. N0: No tumor involvement of regional lymph node(s). N1: Tumor involvement of regional lymph node(s). M0: No distant metastasis. (AJCC 9th ed.)