Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The mediastinal contours are within normal limits . The thoracic aorta is tortuous with mild calcification of the aortic knob . The cardiac silhouette is normal in size . The hilar contours are within normal limits . The lungs are symmetrically well - expanded and well - aerated without focal consolidation , pleural effusion or pneumothorax . The pulmonary vasculature is not engorged . Mild multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .