What are the routes of venous drainage seen with portal hypertension?

1. Left gastric vein to esophageal veins to azygos system
2. Superior rectal vein to middle or inferior rectal veins to IVC
3. Paraumbilical veins to epigastric veins
4. Colonic veins to systemic retroperitoneal veins
5. Splenic vein to renal vein