Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is progression of the left basilar opacity silhouetting the hemidiaphragm . Vague right basilar opacity is also seen but unchanged and potentially atelectasis . Bilateral perihilar opacities are likely due to scarring as seen on prior CT . Moderate cardiac enlargement is again noted . Dense atherosclerotic calcifications are seen in the aorta as well as lower thoracic kyphoplasty changes .
    OUTPUT:
    
Increased retrocardiac opacity which could be due to combination of prominent fat and atelectasis as seen on prior chest CT although superimposed infection or effusion would be possible .