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[Echocardiographic diagnosis of a thrombus trapped in a patent foramen ovale. Apropos of a case].

The authors report the case of a patient presenting with pulmonary embolism in which transthoracic echocardiography showed the presence of an intracardiac thrombus trapped in a patent foramen ovale; this was confirmed at surgery. It is rare to see this type of thrombus (which usually gives rise to paradoxical embolism) by transthoracic echocardiography. Previously, this used to be a postmortem diagnosis but the condition is often suspected nowadays when deep venous thrombosis and/or pulmonary embolism, an unexplained systemic embolism and a right-to-left interatrial shunt, are associated. However, the diagnosis can only be confirmed by the visualisation of the thrombus crossing the interatrial septum.