Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours are stable . The aortic arch shows patchy calcification . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are similar along the lower thoracic spine . Incompletely imaged posterior fusion hardware placed within the thoracolumbar spine appears unchanged to the degree visualized .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .