Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is tortuous as before The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There are subtle persistent linear basal opacities which could represent some atelectasis or scarring at the bases . Mild eventration of the right hemidiaphragm is stable . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Bibasilar opacities are consistent with scarring or atelectasis . Persistently elevated right hemidiaphragm is stable from the prior study .