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Fig. 2. —Helical CT scan obtained during pancreatic phase in 52-year-old man reveals small hypoattenuating mass (arrow) in pancreatic head. Tumor abuts superior mesenteric vein (arrowhead), but tumor-to-vessel circumferential contiguity is less than 50%, indicating absence of venous invasion. Surgical exploration confirmed absence of venous invasion, and tumor was resected without venous resection.