[Aneurysm of the interauricular septum: an exceptional cause of late systolic click. Echocardiographic diagnosis].

A 54 years old patient was referred for echocardiographic study because of a non-ejective click, diagnosed as mitral valve prolapse syndrome. 2d and M mode ultrasonic study showed a normal mitral valve and atrial septum aneurysm. The pathogenic and echocardiographic features of the inter atrial septum aneurysms are discussed.