Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are within normal limits . The trachea is central . The cardiomediastinal contour is normal . The heart is not enlarged . No consolidation , pneumothorax or pleural effusion seen . The visualized bony structures demonstrate moderate multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process seen .