portosystemic anastomosis
↑ portal pressure → varices formation
| Site of Portosystemic anastomosis | Portal/Systemic Veins |
|---|---|
| Lower Oesophageal | - Portal: left gastric veins - Systemic: Azygos vein |
| Upper Anal Canal | - Portal: Superior rectal veins - Systemic: Middle and Inferior rectal veins |
| Umbilical | - Portal: Veins ligamentum teres - Systemic: Superior and Inferior Epigastric Veins |
| Bare Area of Liver | - Portal: Hepatic and Portal veins - Systemic: Inferior Phrenic veins |
| Retroperitoneal | - Portal: Colonic veins - Body wall veins |