Echocardiographic findings in persistent truncus arteriosus in a young adult.

are presented. Several echocardiographic abnormalities were observed, namely (I) diastolic fluttering of the anterior mitral leaflet, (2) dilatation of the 'aortic' root, (3) four 'aortic' valve cusp echoes, (4) separation of the 'aortic' cusps during diastole, (5) dilatation of the right ventricle with paradoxical motion of the septum, (6) the anterior wall of the 'aorta' was anterior to the septum and the posterior 'aortic' wall posterior to the closed position of the mitral valve. The significance of these findings is discussed.