Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Cardiomediastinal silhouette and hilar contours are stable . Lungs are clear . There is no interstitial edema . Lungs are hyperinflated with flattening of the diaphragm . Blunting of the left costophrenic angle is chronic and unlikely to represent effusion . There is no pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Hyperinflation is suggestive of COPD .