Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . There is no evidence of pleural thickening or calcified pleural plaques . The lungs are hyperinflated , without consolidation , mass , edema , pleural effusion , or pneumothorax . A left chest wall AICD device is seen with leads in expected position of the right atrium and right ventricle . Moderate degenerative changes are seen in the thoracic spine , with mild height reduction of a few mid thoracic vertebral bodies .
    OUTPUT:
    
Emphysema . No radiographic evidence of prior asbestos exposure .