Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate mild hyperexpansion . The lungs are clear . There is no pneumothorax or pleural effusion . The hilar and cardiomediastinal contours are normal . Some atherosclerotic calcification in the aortic arch is noted . Pulmonary vascularity is normal .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Mild hyperexpansion of the lungs can be suggestive of COPD .