Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal . Cardiomediastinal sillhouette and hilar contour are unremarkable . Mild bibasilar atelectasis is unchanged from prior study . Increased reticular nodular markings bilaterally appear similar to prior examination and better evaluated on prior CT examination . There is no large pleural effusion or pneumothorax . The bony structures are grossly unremarkable . There is mild hyperinflation and diaphragm flattening , suggestive of emphysema .
    OUTPUT:
    
1 . No acute intrathoracic abnormality . 2 . Emphysema . 3 . Unchanged diffuse reticular nodular pattern better visualized on prior chest CT , suggestive of smoking - related interstitial disease .