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Fig. 7. —Periarterial streaks in unresectable pancreatic adenocarcinoma in 66-year-old man with obstructive jaundice. Helical CT scan shows hypodense lesion (arrow) in uncinate process and linear reticular opacities arising from tumor and abutting posterior aspect of superior mesenteric artery (arrowhead). At surgical exploration, invasion of mesenteric artery was found. Resection was not possible, leaving grossly positive margin.