Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . The pulmonary vasculature is normal . Apart from linear scarring in the left lung base , the lungs are clear . Elevation of the left hemidiaphragm is chronic . No pleural effusion or pneumothorax is present . There are multilevel degenerative changes noted within the mid and lower thoracic spine with anterior bridging osteophytes .
    OUTPUT:
    
No acute cardiopulmonary abnormality .