Table 1: Tumor-node-metastasis definitions in the European Neuroendocrine Tumor Society (ENETS) for staging for pancreatic neuroendocrine tumors [14, 15].

T—primary tumor

TxPrimary tumor cannot be assessed
T0No evidence of primary tumor
T1Tumor limited to the pancreas and size <2 cm
T2Tumor limited to the pancreas and size 2–4 cm
T3Tumor limited to the pancreas and size >4 cm or invading duodenum or bile duct
T4Tumor invading adjacent organs (stomach, spleen, colon, adrenal gland) or wall of large vessels (celiac axis or superior mesenteric artery)

N—regional lymph nodes

NxRegional lymph node cannot be assessed
N0No regional lymph node metastasis
N1Regional lymph node metastasis

M—distant metastasis

MxDistant metastasis cannot be assessed
M0No distant metastasis
M1Distant metastasis