1. Exocrine and Endocrine Pancreas Anatomic subsites of the pancreas. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

2. Exocrine and Endocrine Pancreas Regional lymph nodes of the pancreas (anterior view). Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

3. Exocrine and Endocrine Pancreas Regional lymph nodes of the pancreas (anterior view with pancreatic body removed to reveal retroperitoneal vessels and lymph nodes). Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

4. Exocrine and Endocrine Pancreas Posterior view of pancreatic head with dotted line indicating the location of the confluence of the portal and superior mesenteric veins. The hatched area shows the uncinate process margin. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

5. Exocrine and Endocrine Pancreas T1 (left of dotted line) is defined as tumor limited to the pancreas 2 cm or less in greatest dimension. T2 (right of dotted line) is defined as tumor limited to the pancreas more than 2 cm in greatest dimension. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

6. Exocrine and Endocrine Pancreas Two views of T3, which is defined as tumor that extends beyond the pancreas but without involvement of the celiac axis or the superior mesenteric artery. Left of the dotted line: tumor invades the common bile duct without involving the superior mesenteric artery. Right of the dotted line: tumor invades peripancreatic tissues without involving the celiac axis. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

7. Exocrine and Endocrine Pancreas T3: tumor invades duodenum without involvement of the superior mesenteric artery. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

8. Exocrine and Endocrine Pancreas T3: tumor invades spleen without involvement of celiac axis or superior mesenteric artery. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

9. Exocrine and Endocrine Pancreas Two views of T3 that show tumor abutting but not encasing the superior mesenteric artery and the portal vein. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

10. Exocrine and Endocrine Pancreas Two views of T4, which is defined as tumor encasing the celiac axis (above dotted line) or (below dotted line) the superior mesenteric artery (unresectable primary tumor). Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

11. Exocrine and Endocrine Pancreas N1 is defined as regional lymph node metastasis. Here, the primary tumor and single nodal metastasis are located within the head of pancreas. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

12. Exocrine and Endocrine Pancreas N1 is defined as regional lymph node metastasis. Here, the primary tumor and multiple nodal metastases are located in the head of pancreas. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

13. Exocrine and Endocrine Pancreas N1 is defined as regional lymph node metastasis. Here, the primary tumor is located in the body of pancreas with multiple nodal metastases in the head and body of pancreas. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer

14. Exocrine and Endocrine Pancreas N1 is defined as regional lymph node metastasis. Here, the primary tumor is located in the tail of pancreas with multiple nodal metastases in the tail of pancreas and hilum of spleen. Compton, C.C., Byrd, D.R., et al., Editors. AJCC CancerStaging Atlas, 2nd Edition. New York: Springer, 2012. ©American Joint Committee on Cancer