Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The aorta is unfolded . Hilar contours are unremarkable . Pulmonary vasculature is not engorged . Linear and streaky opacities in the lung bases likely reflect areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are mild multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis .