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Fig. 4D. —67-year-old man with carcinoma of pancreatic head.

A—D, Helical CT scans show dilatation of gastrocolic trunk (GT) (6 mm) and posterosuperior pancreaticoduodenal vein (PS) (5 mm) that resulted from tumor invasion of anteroinferior pancreaticoduodenal vein (AI), posteroinferior pancreaticoduodenal vein (PI), and inferior pancreaticoduodenal vein (IP). Portosuperior mesenteric vein is normal. Note drainage tube (arrowhead) in A and B. AS = anterosuperior pancreaticoduodenal vein, SMV = superior mesenteric vein, SMA = superior mesenteric artery, JT = first jejunal trunk, Ca = carcinoma.