Abstract: Cardiac myxomas are benign tumors of the heart with a surgical incidence of about 0.5/million population/year. They usually present during 4th to 6th decades and are more commonly seen in woman. About 75% arise in the Left Atrium (LA), most are single pedunculated, although multiple and villous forms have been described. Echocardiography has greatly facilitated the diagnosis of cardiac tumors. We report a case of left atrial myxoma as a source of emboli and incidental finding of localized descending aortic dissection subsequent a remote traumatic deceleration injury of the thoracic aorta. This is the first case of coexistence LA myxoma and aortic dissection.