Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . Patchy opacities are demonstrated in both lung bases which may reflect atelectasis but infection is not excluded . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar patchy opacities may reflect atelectasis but infection is not excluded in the correct clinical setting .