Stage IB Ampulla of Vater Cancer AJCC v8

**Semantic type:** Neoplastic Process

**Definition:** Stage IB includes: (T1b, N0, M0); (T2, N0, M0). 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 IB Ampulla of Vater Cancer - Stage IB Ampulla of Vater Carcinoma AJCC v8