Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The aortic knob is calcified . The mediastinal and hilar contours are otherwise unremarkable . The pulmonary vascularity is not engorged . The lungs are clear . No pleural effusion or pneumothorax is visualized . Mild degenerative changes are seen in the thoracic spine . Partially imaged is orthopedic hardware within the right humeral head .
    OUTPUT:
    
No acute cardiopulmonary abnormality .