Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal , and hilar contours appear unremarkable . The lungs are clear . No pleural effusion or pneumothorax is seen . No pulmonary vascular congestion is present . There are multilevel degenerative changes of the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .