Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . Heart size is mildly enlarged but similar . The aorta remains unfolded . The mediastinal and hilar contours are otherwise unremarkable . Biapical scarring is symmetric . Pulmonary vasculature is not engorged . Patchy opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with patchy opacities in lung bases , possibly atelectasis . Please note that aspiration or infection can not be excluded in the correct clinical setting .