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We report on a patient suffering from Budd--Chiari disease who developed heparin-induced thrombocytopenia preoperatively. Dorsocranial liver resection and hepatoatrial anastomosis were performed with the extracorporeal circulation and perioperative anticoagulation was achieved with r-hirudin. Surprisingly, thrombus formation was observed in the venous reservoir although ACT was 590 s and aPTT 55 s. An additional bolus of hirudin and rinsing the reservoir allowed unproblematic discontinuation of the cardiopulmonary bypass.