Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unremarkable . No pulmonary vascular congestion is present . Aside from mild bibasilar atelectasis , the lungs are clear . No focal consolidation , pleural effusion or pneumothorax is seen . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .