Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . Again seen is mild hyperinflation of the lungs with upper zone hyperlucency , compatible with COPD . There is no pneumothorax or focal consolidation . There is persistent blunting of the costophrenic angles , which may denote tiny pleural effusions or mild scarring .
    OUTPUT:
    
No acute intrathoracic process .