Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . No free air seen below the right hemidiaphragm . Mild bibasilar atelectasis . The heart is top - normal in size . No definite signs of pneumonia , edema or large effusion . No definite pneumothorax . Mediastinal contour appears normal . No acute bony abnormalities .
    OUTPUT:
    
Mild basilar atelectasis , top - normal heart size .