Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mild atherosclerotic calcifications are seen at the aortic knob . Mediastinal and hilar contours are unchanged with a small to moderate size hiatal hernia again noted . The pulmonary vasculature is normal . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . Multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .