Ebstein's anomaly is a defect of the tricuspid valve, which separates the right atrium from the right ventricle. The valve is displaced into the right ventricle. As a result, the septal leaflet is tied and the anterior leaflet is enlarged. This abnormal valve can lead to backflow of blood into the right atrium, which is larger than normal in this condition.
Watch the following video animation to learn more about this condition and treatment options.