BCS: Inherited risk factor: factor V Leiden mutation n = 11, prothrombin gene mutation n = 2, protein C deficiency n = 4. Acquired risk factor: oral contraceptives n = 12, myeloproliferative disease n = 12, lupus anticoagulant n = 2, inflammatory bowel disease n = 2, liver abscess n = 1.

PVT: Inherited risk factor: factor V Leiden mutation n = 7, prothrombin gene mutation n = 3, protein C deficiency n = 6, protein S deficiency n = 2, antithrombin deficiency n = 1. Acquired risk factor: oral contraceptives n = 12, myeloproliferative disease n = 16, cirrhosis n = 16, abdominal surgery n = 28, pancreatitis n = 10, umbilical vein infection n = 6, inflammatory bowel disease n = 4, liver abscess n = 4, abdominal trauma n = 2, paroxysmal nocturnal hemoglobinuria n = 2, pregnancy n = 2, nodular regenerative hyperplasia n = 2, portal sclerosis n = 1, hepatocellular carcinoma n = 1, seminoma n = 1.