Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The aorta is mildly tortuous . Mediastinal and hilar contours are otherwise unchanged . Lungs are clear and the pulmonary vasculature is normal . No pleural effusion or pneumothorax is identified . Mild degenerative changes are noted in the thoracic spine which demonstrates a mild S - shaped scoliosis .
    OUTPUT:
    
No acute cardiopulmonary abnormality .