Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs remain hyperinflated with flattening of the diaphragms and increased retrosternal clear space compatible with COPD . Cardiac silhouette size is normal . The aortic knob is calcified . Mediastinal and hilar contours are within normal limits . Lungs are clear . No focal consolidation , pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality . COPD .