Stage I Ampulla of Vater Cancer AJCC v8

**Semantic type:** Neoplastic Process

**Definition:** Stage I includes: IA: (T1a, N0, M0); IB: (T1b, N0, M0); (T2, N0, M0). T1a: Tumor limited to ampulla of Vater or sphincter of Oddi. T1b: Tumor invading beyond the sphincter of Oddi (perisphincteric invasion) and/or into the duodenal submucosa. T2: Tumor invading into the muscularis propria of the duodenum. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.)

**Synonyms:** - Stage I Ampulla of Vater Cancer - Stage I Ampulla of Vater Carcinoma AJCC v8