- No evidence of tumor extension to superior mesenteric artery, hepatic artery, celiac axis, aorta, or inferior vena cava, and no evidence of occlusion or encasement of the superior mesenteric vein or superior mesenteric vein/portal vein confluence, as assessed by computed tomography (CT) using pancreatic protocol (or magnetic resonance imaging [MRI] in patients who cannot undergo CT) and EUS