A radionuclide angiogram in a patient with Ebstein's anomaly showed a very dilated right atrium with a minimally enlarged right ventricle and a normal sized left ventricle. This study led to the establishment of a definitive diagnosis by means of an echocardiogram. Late close of the tricuspid valve was demon strated. In addition prolapse of the tricuspid and mitral valves was docu mented. A tricuspid valve prolapse has never been reported in this condition.
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