Patients with inherited thrombophilia are at high risk for the development of venous thrombosis that manifests mainly as deep venous thrombosis of the legs and/or pulmonary embolism. We report spontaneous right-sided intracardiac thrombosis in a young man as an unusual manifestation of inherited thrombophilia. The diagnosis of thrombophilia was confirmed by demonstration of the prothrombin-G20210A-mutation in the homozygous state. A second spontaneous intracardiac thrombosis occurred 3 years after discontinuation of oral anticoagulant treatment. This indicates the high risk for recurrence in patients developing intracardiac thrombosis in the absence of an underlying cardiac disease and warrants long-term oral anticoagulant treatment.
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