Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is moderately enlarged . The mediastinal and hilar contours are relatively unchanged with the thoracic aorta appearing mildly tortuous . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . Multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .