Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate hyperexpansion of the lungs and flattening of the hemidiaphragms , as before , reflecting COPD . There is no evidence of focal consolidation , pneumothorax or overt pulmonary edema . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .