Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are noted with secondary crowding of the bronchovascular markings . There is no confluent consolidation or effusion . The cardiomediastinal silhouette is likely within normal limits . Atherosclerotic calcifications noted at the aortic arch . Degenerative changes seen at the shoulders .
    OUTPUT:
    
Increased interstitial markings throughout the lungs likely largely due to low lung volumes and secondary atelectasis . Superimposed vascular congestion or atypical infection would be difficult to exclude .