Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . Aorta is tortuous and mildly calcified . The mediastinal and hilar contours are otherwise unremarkable . Streaky opacity in the right lung base likely reflects atelectasis or scarring . No focal consolidation , pleural effusion or pneumothorax is visualized . No acute osseous abnormality is seen .
    OUTPUT:
    
Scarring versus atelectasis in the right lung base . Otherwise no acute cardiopulmonary abnormality .