Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . The aorta remains tortuous but unchanged . Mediastinal and hilar contours are similar compared to the previous radiograph with widening of superior mediastinum perhaps related to underlying lymphadenopathy . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is demonstrated . Mild to moderate multilevel degenerative changes are again seen within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .