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[Excessive bleeding in the patients with past history of Hassab's operation].

We report two cases of massive perioperative bleeding and multiple organ failure with past history of Hassab's operation. Massive bleeding occurred during laparotomy and thoracocentesis in each case. After Hassab's operation, collateral circulation and coagulation disorders could develop, and unanticipated massive bleeding might occur. Preparations for excessive bleeding and postoperative intensive care would be required for the patients who have past history of Hassab's operation.