Conclusion:
Accessory mitral valve is a rare congenital heart anomaly. In echocardiography, it is seen as mitral valve mass and can present with or without significant LVOT stenosis. AMV is seen mostly with other congenital anomalies such as bicuspid aortic valve.
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  6. Shi-Min Yuan, Hua Jing, Jacob Lavee. Tumors and tumor-like lesions of the heart valves. Rare Tumors. 2009;28;1(2): e35. doi: 10.4081/rt.2009.e35Figures and movie clips legend :Figure 1: Long axis view (143°) at transesophageal echocardiography showed large cyst like mass at ventricular side of anterior mitral leaflet during systole. Figure 2: Long axis view (120°) at transesophageal echocardiography showed large cyst like mass at ventricular side of anterior mitral leaflet during systole. Movie clip 1: Transesophageal echocardiography showed large mobile cyst like mass attached to anterior mitral leaflet Movie clip 2: Transthoracic echocardiography showed large mobile mass attached to anterior mitral leaflet protrude to left ventricle outflow tract during systole