<prompt> Which is the most common primary malignancy of hea ?RabdomyosarcomaMyxomaFibromaLymphoma  <response>: Myxoma is the most common primary neoplasm of hea 30- 50. 75 of cardiac myxomas develop in the left atrium. Histologically, it is composed of a myxomatous stroma with large stellate cells mixed with multiWnuleated cells and covered with endothelium. Unusual benign tumors of hea are fibroma, lipoma, angioma, teratoma and cysts. Reference: Schwaz Principles of Surgery 9e chapter 21. 