An atrial myxoma is a benign tumor of the heart, commonly found within the left and right atria on the interatrial septum. ==Causes== Myxomas are the most common type of primary heart tumor. The tumor is derived from multipotential mesenchymal cells and may cause a ball valve-type obstruction. About 75% of myxomas occur in the left atrium of the h...
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http://en.wikipedia.org/wiki/Atrial_myxoma
Type: Term Definitions: 1. a primary cardiac neoplasm arising most commonly in the left atrium as a soft polypoid mucinous mass attached by a stalk to the atrial septum; it may resemble an organized mural thrombus. The symptoms may include cardiac murmurs, which change with alteration of body position and signs of mitral stenosis or insufficiency, ...
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http://www.medilexicon.com/medicaldictionary.php?t=58659
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