A patient who was evaluated for a syncopal episode was found by two-dimensional (2D) echocardiography to have an aneurysm of the atrial septum.
The atrial septal aneurysm appeared as a localized outpouching of the atrial septum that protruded into the left atrium during systole and into the right atrium during early diastole. The 2D echocardiography permits the definitive diagnosis of this condition by a noninvasive technique.
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