Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperinflated and clear . Flattened diaphragms with prominent retrosternal clear space may reflect COPD . No large effusion or pneumothorax . Cardiomediastinal silhouette is normal . Bony structures are intact .
    OUTPUT:
    
Probable COPD without superimposed acute process .