Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is accentuated , but appears mild to moderately enlarged . The aorta is unfolded . The mediastinal contours otherwise unremarkable . Crowding of the bronchovascular structures is present due to low lung volumes , but no overt pulmonary edema is present . Bibasilar airspace opacities are more pronounced in the retrocardiac region , and could reflect areas of atelectasis but infection or aspiration can not be excluded . Previously noted small bilateral pleural effusions appear nearly resolved , and no pneumothorax is present . No acute osseous abnormalities are seen .
    OUTPUT:
    
Low lung volumes with bibasilar opacities , more so on the left . Findings could reflect atelectasis but infection or aspiration can not be excluded .