Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased interstitial markings again seen throughout the lungs which are unchanged and were further characterized by a prior CT . Linear left basilar opacity may represent superimposed atelectasis although infection is not excluded . The cardiomediastinal silhouette is stable . No acute osseous abnormalities .
    OUTPUT:
    
Increased interstitial markings throughout the lungs compatible with a chronic underlying process better seen by prior CT . Linear left basilar opacity may be due to superimposed atelectasis although acute infection would be possible .