Rules for Classification

This classification system applies to well‐differentiated neuroendocrine tumours (carcinoid tumours and atypical carcinoid tumours) of the pancreas.

High‐grade neuroendocrine carcinomas are excluded and should be classified according to criteria for classifying carcinomas of the pancreas.

Regional lymph nodes

The regional lymph nodes correspond to those listed under the appropriate sites for carcinoma.

TNM Clinical Classification – Pancreas

T – Primary Tumour

TX	Primary tumour cannot be assessed
T0	No evidence of primary tumour
T1	Tumour limited to pancreas*, 2 cm or less in greatest dimension (Fig. 263)
T2	Tumour limited to pancreas*, more than 2 cm but less than 4 cm in greatest dimension (Fig. 263)
T3	Tumour limited to pancreas*, more than 4 cm in greatest dimension (Fig. 264) or Tumour invading duodenum or bile duct.
T4	Tumour perforates visceral peritoneum (serosa) or other organs or walls of larger vessels (Fig. 265)

Notes

For any T, add (m) for multiple tumours.

^* This includes invasion of the peripancreatic adipose tissue.

N – Regional Lymph Nodes

M – Distant Metastasis