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Fig. 1D. —Normal CT anatomy of inferior peripancreatic veins in 56-year-old man with ampullary carcinoma. A—D, Selective pancreatic arteriogram (A) and three consecutive helical CT images using selective pancreatic arteriography (B—D) reveal normal anatomy of inferior peripancreatic veins. Anteroinferior pancreaticoduodenal vein (AI) passes between inferior surface of pancreatic head and third portion of duodenum. Posteroinferior pancreaticoduodenal vein (PI) passes transversely above AI. AI and PI join together to form inferior pancreaticoduodenal vein (IP), which drains into first jejunal trunk (JT), which then drains into superior mesenteric vein (SMV) after passing posterior to superior mesenteric artery (SMA). Note catheters in B—D (arrowheads). 1stD = first duodenal vein, PS = posterosuperior pancreaticoduodenal vein, GT = gastrocolic trunk, AS = anterosuperior pancreaticoduodenal vein, Du = duodenum. (Reprinted with permission from [8]).