Shone complex

Shone's syndrome is a rare congenital heart disease described by Shone in 1963. In the complete form, four left-sided defects are present: Supravalvular mitral membrane (SVMM) Parachute mitral valve Subaortic stenosis (membranous or muscular) Coarctation of the aortaOf these four defects, supravalvular mitral membrane (SVMM) is the first to occur, and triggers the development of the other three defects. [Source: Wikipedia ]