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Classification of congenital PSVS [17]. CAPV indicates congenital absence of the portal vein.
| Type | Description |
|---|---|
| I | No intrahepatic portal flow (CAPV or type I Abernethy malformation) |
| II | Partial shunt with preserved hepatic portal flow (type II Abernethy malformation) |
| IIa | Arising from left or right portal vein (including PDV) |
| IIb | Arising from main portal vein (including its bifurcation or splenomesenteric confluence) |
| IIc | Arising from the mesenteric, gastric, or splenic veins |
