Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is unchanged , and within normal limits . The aorta is tortuous and demonstrates mild calcification of the aortic arch . Mediastinal and hilar contours are unremarkable otherwise . Pulmonary vascularity is normal . The lungs are clear . No pleural effusion or pneumothorax is present . There are mild degenerative changes of the thoracic spine . Cervical spinal fusion hardware is incompletely assessed .
    OUTPUT:
    
No acute cardiopulmonary abnormality .