Chest X-ray PA view showing a bulge along the left border, below the aortic knuckle and pulmonary bay. Sternal wires are seen near the mid line, which would suggest that the person has possibly undergone a cardiac surgery by sternotomy.
Bulge below the pulmonary bay can be due to several reasons:
Prominent left atrial appendage as in severe mitral stenosis
Dilated right ventricular outflow tract as in Ebstein’s anomaly or endomyocardial fibrosis