Ebstein's Anomaly

The left illustration shows a normal heart, and the right illustration shows defects related to Ebstein's anomaly. The tricuspid valve, between the two right heart chambers, doesn't work properly. The upper right chamber (right atrium) is enlarged and the lower right chamber (right ventricle) is smaller than usual. A hole between the two upper chambers (atrial septal defect) often occurs in Ebstein's anomaly.