The authors describe the case of a patient referred for evaluation of multiinfarct dementia. Conventional echocardiography revealed an aneurysm of the interatrial septum. A transesophageal echocardiogram demonstrated surimposed thrombus. This rare cause of systemic emboli can be diagnosed only by transesophageal echocardiog raphy and is of major interest to avoid recurrence of ischemic strokes.
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