1. Result:Severe patients with MVPS were diagnosed as primary myxomatous degeneration by surgery, pathology and electron-microscope.

2. Objective:To investigate the diagnostic value of electron beam CT(EBCT)in benign non- myxomatous cardiac neoplasms.

3. Objective:To evaluate the role of magnetic resonance imaging (MRI)in the diagnosis of non myxomatous primary tumors of the heart and pericardium.

4. Objective:To review the diagnosis, pathological changes and surgical experience in the treatment of myxomatous degeneration of mitral valve (MDMV).

5. Although heart wall thickness was reduced overall, specific areas exhibited morphological changes consistent with myxomatous degeneration in the walls of knockout hearts.