Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated . The lung fields are clear . The cardiomediastinal silhouette is unremarkable . Osseous structures are within normal limits . No pneumothorax or pleural effusion .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Hyperinflation consistent with COPD unchanged compared the prior study .