Cyst-like Lesion on Mitral Valve

A 62-year-old woman presented with exertional dyspnea and fever. On physical examination, a holosystolic murmur was found. A cystic lesion was detected by echocardiography. At surgery, a membrane was seen on the anterior leaflet, which extended from the primary chordae to papillary muscle of the anterior leaflet, making a cavity. There was also fenestration in the mid portion of the anterior leaflet. Leaflet augmentation with a pericardial patch was performed.