<unk>  (aka<unk>  is a form of heart disease in which two of the leaflets of the<unk><unk>  fuse during development in the womb resulting in a two-leaflet<unk><unk>  instead of the normal three-leaflet (tricuspid)<unk> .<unk>  is the most common cause of heart disease present at birth and affects approximately 1.3% of adults. Normally, the mitral<unk>  is the only<unk><unk>  and this is situated between the heart's left atrium and left ventricle. Heart<unk> s play a crucial role in ensuring the unidirectional flow of blood from the atrium to the ventricles, or from the ventricle to the aorta or pulmonary trunk.<unk>  is normally inherited.
Bicuspid aortic valve
Quadricuspid aortic valve
Flutter valve
Mitral annular calcification
Supravalvular aortic stenosis
Accessory auricle
Overriding aorta
Mitral annular disjunction