Congenital mitral valve disease (CMVD) can be classified based on the anatomic distribution of the structural defects.
(1) abnormality involving the mitral valve
(2) functional left ventricle
Location of Abnormality
above the level of the annulus or valve leaflets
involving the annulus and/or valve leaflets
involving the chordae tendineae and/or papillary muscles
combination of 2 or 3 of the above types
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