Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient has had median sternotomy , probably in childhood given the small diameter of the sternal wires . Right aortic arch can be seen with a variety of congenital cardiac conditions . Misalignment between the second and third sternal wires could be significant an should be evaluated clinically . Low lung volumes exaggerate heart size , probably normal , and account for for the heterogeneity in vascular crowding at the lung bases . There is no good evidence for pneumonia . No effusion or pneumothorax .
    OUTPUT:
    
No pneumonia . Possible childhood surgery for congenital heart disease .