<prompt> Answer this question truthfullyCould you please explain what Budd-Chiari syndrome is?  <response>: <reason> Budd-Chiari syndrome is associated with a wide range of etiologies. On the basis of underlying cause Budd- Chairi syndrome can be primary 75 caused by thrombosis of the hepatic vein or secondary 25 caused by invasion compression of the hepatic vein by an outside structure such as a tumor, abscess or cysts. Causes include myeloproliferative disorders, malignancy, paroxysmal nocturnal hemoglobinuria, antiphospholipid syndrome, factor V leiden mutation, infections and benign liver lesions, oral contraceptives and pregnancy, hypercoagulable states, Behçets syndrome, membranous webs. 