A primary cardiac neoplasm arising most commonly in the left atrium as a soft polypoid mass attached by a stalk to theseptum; it may resemble an organized mural thrombus, and the symptoms may include cardiac murmurs (the ploprepresents the diastolic prolapse of the myxoma through an opened mitral or tricuspid valve), which change with alterationof body position, signs of mitral stenosis or insufficiency, with continuous danger of embolism by fragments of the tumor oits entire mass, dyspnea of effort, weight loss, fatigue, low-grade fever, polyneuritis, nausea, syncopal attacks.