Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased interstitial markings are seen throughout the lungs bilaterally but appear most severe overlying the upper lobes . Lung volumes are relatively low . There is no definite superimposed focal consolidation and the pattern appears grossly similar compared to prior . Cardiomediastinal silhouette is unchanged . Known adenopathy is better seen on prior CT scan . Posterior left rib fractures are noted . Left breast prosthesis is visualized .
    OUTPUT:
    
Chronic fibrotic changes in the lungs without definite acute cardiopulmonary process noting that subtle changes could easily be obscured .