Incomplete isolated cleft of the anterior mitral valve: first reported as triangular defect

A 16-year-old girl with a 12 year history of systolic murmur at the apex presented with mitral regurgitation. Two-dimensional echocardiography in the parasternal long-axis view showed the part of the anterior mitral valve (AMV) which near the root was thin without echo drop-out ( Panel A , arrowhead). The parasternal short-axis view showed a cleft on AMV ( Panel B , arrowhead) and moderate-severe regurgitation through the …