Budd–Chiari can be primary (thrombosis of hepatic veins) or secondary (external compression or invasion).
| Hepatic outflow tract Thrombosis | ‣ , ‣ (JAK2+), pregnancy, oral contraceptives, ‣ , paroxysmal nocturnal hemoglobinuria |
|---|---|
| External compression | ‣ , ‣ , cysts, abscesses |
| Membranous obstruction of IVC | Especially in Asian patients (can mimic “malformation”) |