<unk>  is a congenital obstructive narrowing of the aorta just above the aortic valve and is the least common type of aortic stenosis. It is often associated with other cardiovascular anomalies and is one of the characteristic findings of Williams syndrome. The diagnosis can be made by echocardiography or MRI. __TOC__
Supravalvular aortic stenosis
Bicuspid aortic valve
Quadricuspid aortic valve
Mitral annular calcification
Accessory auricle
Overriding aorta
Mitral facies
Pulmonary valve stenosis