Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Improved lung volumes bilaterally . Clear lungs without pneumothorax or pleural effusion . Heart size is top normal with normal mediastinal contour and hilus . Moderate degenerative disease of the thoracic spine without additional bony abnormality .
    OUTPUT:
    
Normal chest radiographs with moderate degenerative disease of the thoracic spine .