[Budd-Chiari syndrome and JAK2 gene mutation].

Budd-Chiari syndrome (BCS) is a rare vascular disorder characterized by obstruction of hepatic venous outflow, culminating in elevated hepatic and portal venous pressure. BCS is associated with myeloproliferative neoplasms (MPN) in 40% of cases, which is significantly higher than the rate observed in other venous thrombotic conditions, and suggests that MPN may contribute to the etiology of BCS. In particular, the JAK2 V617F mutation has recently attracted substantial attention, given its profound association with thrombogenesis, mechanically implicated through endothelial damage, increased blood cell adhesion, and facilitation of neutrophil extracellular trap formation. A common treatment approach consists of anticoagulation for prevention and treatment of thrombosis, and cytoreductive therapy targeting MPN. However, as no definitive evidence exists for this approach, a bespoke therapeutic strategy tailored to individual patient profiles is required.