What does CT tells us regarding resectability?

Longstanding CT is done to see resectability, sees distant metastasis (liver...), encasement of celiac axis/SMA, occlusion of portal vein/SMV. If tumor in tail/body usually easier to resect since no vessels are involved, while in head, bulb, duodenum and stomach are involved, so we remove them monoblock (all together) + remove SMA + SMV (which can be reconstructed) 10-15% are resectable, and 40% 5 year death.