Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . The lungs are clear without focal consolidation , effusion or pneumothorax . There is slight coarsening of interstitial markings , which could indicate underlying fibrosis / emphysema . The cardiomediastinal silhouette appears normal . The bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process . Probable emphysema .