[Aneurysm of the interauricular septum by hernia of Vieussens' valve, and suspected coronary embolism].

During the hemodynamic evaluation of a young patient with heart failure whose electrocardiogram showed sequels of anterior necrosis, an aneurysm of the fossa ovalis was seen at cineangiography. Selective coronary angiography showed an interruption of filling of the anterior interventricular artery just distal to the branching of the first septal artery: it raised therefore the possibility of the embolic origin of that myocardial infarction. In connection with this case study, angiographic aspect, pathogenesis and the embolic role of the aneurysm of the fossa ovalis were discussed.