A 75-year-old man with borderline resectable adenocarcinoma of the head of the pancreas with borderline vascular encasement, treated with FOLFIRINOX. Tumor size was unchanged (tumor diameter 100% of the baseline, tumor volume 98%), and CA19–9 93% of the baseline after chemotherapy. A Baseline arterial and B venous phase CT. C Post-chemotherapy arterial and D venous phase CT. Tumor iodine uptake and normalized tumor iodine uptake were A 1.3 mg/mL and 20%, B 1.4 mg/mL and 31%, C 1.4 mg/mL and 12%, and D 1.6 mg/mL and 36%.