Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Study is slightly limited due to the patient 's chin obscuring assessment of the lung apices . Additionally , the patient is mildly rotated . Heart size is mildly enlarged but unchanged . The mediastinal and hilar contours are similar . There is mild pulmonary vascular congestion . Patchy opacities in the lung bases could reflect atelectasis but infection can not be excluded . No large pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild pulmonary vascular congestion . Bibasilar airspace opacities could reflect atelectasis but infection can not be excluded .