Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are bibasilar opacities superimposed on chronic increased interstitial markings more superiorly . Cardiomediastinal silhouette is grossly unchanged . No acute osseous abnormalities , degenerative changes seen at the AC and glenohumeral joints bilaterally .
    OUTPUT:
    
Chronic interstitial process , potentially due to edema or other interstitial process . More dense bibasilar opacities could be atelectasis although superimposed infection would be possible , particularly on the right .