Figure 81b

Panel A shows a transesophageal echocardiogram (horizontal view) at the level of the left ventricular outflow tract. A tumor is attached to the left atrial (LA) side of the anterior mitral leaflet (thin arrow), and there is a smaller mass at the ring insertion of the posterior leaflet (thick arrow). Examination of the resected mass (Panel B) showed a mesenchymal, poorly differentiated tumor , consisting of polymorphic, predominantly spindle-shaped cells spreading within the myocardium (M) along preformed vessels (V), corresponding to an angiocarsoma ((hematoxylin and eosin, x200). LV denotes left ventricle, and Ao aorta.