Budd-Chiari syndrome (BCS) occurs as a result of obstruction of hepatic venous outflow at any level from the small hepatic veins to the junction of the inferior vena cava with the right atrium.

Half of the patients with primary Budd-Chiari syndrome are affected with a myeloproliferative disease, the recognition of which is largely based on the assessment of V617F Janus tyrosine kinase 2 ...