Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is tortuous . Atherosclerotic calcifications are demonstrated at the aortic knob . Pulmonary vasculature is normal and the lungs are clear . No pleural effusion or pneumothorax is demonstrated . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .