Table 1 Definitions of ampullary tumor invasion by the American Joint Committee on Cancer, 8th edition.

From: Advantage of endoscopic papillectomy for ampullary tumors as an alternative treatment for pancreatoduodenectomy

Tx

Primary tumor cannot be assessed

T0

No evidence of primary tumor

Tis

Carcinoma in situ

T1a

Tumor limited to ampulla of Vater or sphincter of Oddi

T1b

Tumor invades beyond the sphincter of Oddi and/or into the duodenal submucosa

T2

Tumor invades into the muscularis propria of the duodenum

T3

Tumor directly invades into the pancreas (up to 0.5 cm) or extends into peripancreatic tissue

T4

Tumor involves the celiac axis, superior mesenteric artery or common hepatic artery

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