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The formative tributaries of the splenic vein, tributaries of superior mesenteric vein (gastrocolic trunk, first jejuna vein), and portal vein (left gastric vein) are easily seen. Inferior mesenteric vein has a variable joining mechanism and may be difficult to find on radial endosonography. Posterior superior pancreatico duodenal vein and left gastro-epiploic artery are seen persistently. Other tributaries are untraced and may be difficult to find.
