In the clinical scenario described, a tumor size of 2.5 cm is
clinically staged as a T3 tumor. Pancreatic and bile duct dilatation is not included
in the staging criteria for this disease. Vascular involvement, such as that of the
portal vein in this case, is clinically staged as a T4 tumor. Although no information
is provided about regional node involvement, T4 disease can be staged as either
IVA or IVB. In the absence of demonstrated metastases (stage IVB), this patients
cancer is best described as stage IVA.