Figure 1From: Giant aneurysm of the atrial septum associated with premature closure of foramen ovaleApical four chamber and subcostal views. Note the membrane (arrow) extending from the level of the mitral valve to the upper pulmonary veins. RA; right atrium, LA; left atrium, RV; right ventricle, LV; left ventricle, MV; mitral valve.Back to article page