Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly and stable prosthetic aortic valve are noted . Considerably calcified aortic knob and intact sternal wires are noted . The lungs are hyperinflated with streaky bibasilar opacities likely represent atelectasis and minimal interstitial reticulation in the periphery , better seen on the current CT , likely representing chronic interstitial changes . There is no pleural effusion or pneumothorax . Osseous structures demonstrate multilevel degenerative change in thoracic spine .
    OUTPUT:
    
1 . Moderate cardiomegaly . 2 . Hyperinflated lungs with bibasilar atelectasis , but no evidence for pneumonia .