Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unchanged with the heart size within normal limits . Atherosclerotic calcifications are demonstrated at the aortic knob . Pulmonary vasculature is not engorged . The lungs are hyperinflated but clear . No pleural effusion or pneumothorax is present . Multilevel mild to moderate degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .