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Fig. 5C. —Illustrations show CT findings of normal anatomy of peripancreatic veins and features in tumor invasion of peripancreatic tissues.

Drawing shows changes of peripancreatic veins in carcinomatous tumor involvement (Ca) of second portion of extrapancreatic nerve plexus. Tumor involvement of any inferior peripancreatic veins (AI, PI, and IP) may have caused dilatation of other peripancreatic veins. Nonvisualization of IP, JT, or both with dilatation of other peripancreatic veins indicates tumor invasion of second portion of extrapancreatic nerve plexus and mesenteric root. Note directions of venous blood flow (arrows).