Supravalvular aortic stenosis (SVAS) is the major cardiac lesion of Williams Syndrome (WS). WS also has features of mental retardation (MR), characteristic facies and variable hypercalcemia in ...

Left ventricular outflow obstruction most commonly occurs at the aortic valve itself; however, it can occur above the aortic valve (supravalvular ... echocardiogram can also quantify aortic ...