Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest provided . The lungs are hyperinflated and grossly clear . No convincing evidence for pneumonia or overt CHF . No large effusion or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
COPD without acute superimposed process .