Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased subpleural reticular markings throughout the lungs , most extensive on the left are again seen . There is no superimposed consolidation or effusion . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Chronic changes in the lungs compatible with patient 's pulmonary fibrosis . No definite superimposed acute process noting that one could easily be obscured .