<unk>  is the most uncommon cause of left ventricular outflow tract obstruction (LVOT) accounting for 8% of congenital cases of LVOT obstruction. It is seen in 10% patients with aortic stenosis.
Supravalvular aortic stenosis
Double orifice mitral valve
Subvalvular aortic stenosis
Bicuspid aortic stenosis
Quadricuspid aortic valve
Quadricuspid pulmonary valve
Accessory auricle
Mitral valve sclerosis