Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated , suggestive of emphysematous changes . Interstitial markings are similar to prior exam and may reflect chronic lung disease or mild pulmonary vascular congestion . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is moderately enlarged .
    OUTPUT:
    
No acute findings .