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Figure 4: Types of Abernethy malformation. Type 1a – splenic vein and superior mesenteric vein drain separately into inferior vena cava. Type 1b – splenic vein and superior mesenteric vein form a portal vein that drains into inferior vena cava. Type 2 – Shunt between the portal vein and inferior vena cava

Figure 4: Types of Abernethy malformation. Type 1a – splenic vein and superior mesenteric vein drain separately into inferior vena cava. Type 1b – splenic vein and superior mesenteric vein form a portal vein that drains into inferior vena cava. Type 2 – Shunt between the portal vein and inferior vena cava