Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta is unfolded . Previously demonstrated small hiatal hernia on CT is not seen on this single frontal view . Pulmonary vasculature is normal . Minimal patchy bibasilar opacities likely reflect atelectasis . No pleural effusion or pneumothorax is seen . Degenerative changes are noted involving the thoracic spine and both acromioclavicular joints .
    OUTPUT:
    
Mild bibasilar atelectasis . Previously demonstrated small hiatal hernia seen on CT is not visualized on the current exam .