Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The aorta is slightly unfolded . Mediastinum and hilar contours are otherwise unremarkable . No pulmonary vascular congestion is demonstrated . Patchy opacities within both lung bases , left more so than right , could reflect atelectasis or infection . No pneumothorax or pleural effusion is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy bibasilar airspace opacities could reflect atelectasis but infection is not excluded in the correct clinical setting .