Venous drainage of duodenum and afferents to duodenal varices. 1. PV* = portal vein, 2. SV* = splenic vein 3. SMV* = superior mesenteric vein 4. GT = gastrocolic trunk 5. PSPDV** = posterior superior pancreatico duodenal vein 6. RGEV = right gastroepiploic vein 7. RCV = right colic vein, 8. AIPDV** anterior inferior pancreatico duodenal vein, 9. PIPDV** posterior inferior pancreatico duodenal vein, 10. IPDV** inferior pancreatico duodenal vein, 11. Middle colic vein* 12. Ist jejunal trunk 13. ASPDV** = anterior superior pancreatico duodenal vein, 14. Duodenal vein—subpyloric vein** 15. Duodenal vein—Suprapyloric vein** 16. Prepyloric vein of Mayo 17. Paraumbilical vein* 18. Cystic vein 19. Left gastric vein 20. Right gastric vein. Duodenal varix.