Budd-Chiari syndrome is a relatively rare disorder caused by occlusion of hepatic veins. It presents with abdominal pain, ascites, and hepatomegally.

Budd-Chiari syndrome has four clinical variants:

• acute
• subacute
• chronic
• fulminant

Budd-Chiari syndrome can be:

• primary (congenital obstruction  by webs or diaphragms)
• secondary (multiple causes)

Budd-Chiari syndrome has three morphological types: