Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Mild biapical scarring is noted . Mild retrocardiac parenchymal scarring . The cardiac , hilar and mediastinal contours are normal . No pleural abnormality is seen .
    OUTPUT:
    
No acute cardiopulmonary process . Bilateral apical scarring , symmetrical in distribution . Moderate elongation of the descending aorta . Small retrocardiac parenchymal scarring