Thrombosis of the superior mesenteric vein (VMS) is a frequent cause of ischaemia of the gut (5% to 15% acute intestinal ischaemias). The authors summarize the causes of venous thrombosis, the clinical picture, diagnostic procedure and treatment. They describe the case-history of a 79-year-old patient with thrombosis of the VMS. They revised the abdominal cavity and assessed the correct diagnosis on operation. On account of gangrene of the small intestine resection was performed. For a brief period anticoagulant treatment was administered, food was administered soon. The patient does not require any further revisions of the abdominal cavity. The authors examined thrombophil markers and assessed APV resistance. Relapse of TEN in the form of bilateral massive pulmonary embolization with subsequent anticoagulation.

        Key words: venous thrombosis - APC resistance