Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild biapical scarring is unchanged . Heart size , mediastinal and hilar contours are normal . Mild atelectasis is present at the right lung base . No lung opacities concerning for pneumonia . There is no pleural abnormality . Fracture of the right ninth anterolateral rib is seen , however fracture of eighth rib seen on prior radiograph could not be visualized due to overlying monitoring and supporting device .
    OUTPUT:
    
1 . No pneumonia . 2 . Mild right lower lung atelectasis .