Lateral left thoraxRetrocardiac spa ce occupied in three thirds compressing the barium column due to growth of Ai and VI.Transthoracic echocardiography 1. aneurysmal dilation of the left atrial appendage. 2. Mitralinsufficiency moderate -severe + cleft of the posterior leaflet. Clinical casePreschool female 3 years old, asymptomatic cardiovascular, who was heart murmur auscultation as incidental finding. When R1 single physical examination, breath holosystolic I / VI mitral area radiating to the armpit, physiological split S2, R3 and R4 not.