Cardiac masses are 100 to 1,000 times more likely to represent metastatic disease than primary cardiac tumors. Primary cardiac tumors are rare, with an estimated prevalence of 0.02% of the population, of which myxoma is the most common type. Seventy-five percent of primary cardiac tumors are benign, and papillary fibroelastomas are the second-most- common type. These tumors are thought to have an equal distribution among the sexes, and are most often detected in adults. Approximately 90% of tumors are valvular, involving the aortic valve (45%), mitral valve (35%), tricuspid valve (15%), and pulmonic valve (15%). Their etiology is unknown. Yet, the observation has been made that they often occur in areas of endocardial irritation, such as thickened or stenosed cardiac valves and may, therefore, represent a degenerative process.