abnormal mitral valve morphology mitral valve dysplasia MPheno.ontology MP:0000286 abnormal bicuspid valve morphology Fyler:1508 abnormal mitral valvar morphology any structural anomaly of the valve between the left atrium and the left ventricle of the heart, and contains two cusps, the anterior cusp and the posterior cusp, attached to the outer fibrous ring (annulus) abnormal atrioventricular valve morphology