Echocardiographic Characteristics of cardiac blood cyst
All cases were single and 7 of them were less than 25mm in maximal diameter. In these patients, transthoracic echocardiography revealed a single balloon-like small cyst. The cyst had high tension, the wall was thin and smooth, and calcification could be seen on the wall of the cyst (fig.1). 4 of the cases were attached to the ventricular surface of the anterior mitral leaflet and 1 was attached to the posteromedial papillary muscles and chordae tendineae of the mitral valve. Of these 5 cases, 3 were located in the left ventricular outflow tract (fig.2), of which only 1 resulted in mild obstruction of the LVOT (the maximum flow velocity was 236cm/s, and the pressure gradient was 22mmHg). 2 were attached to the septal leaflet of the tricuspid valve. The other one was located on the tricuspid orifice and connected to the anterior tricuspid valve annulus. The echocardiographic characteristics in this case are atypical. The cyst was 54×31mm and attaches to the atrial surface of the anterior tricuspid valve annulus. Severance and many hyperechogenic masses with various sizes could be seen in the cyst. The wall of the cyst is intact and the shape is regular. With the swing of the cardiac cycle, the diastole reaches tricuspid valve orifice, and the systolic return into the right atrium, resulting in the stenosis of the tricuspid valve.