Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP portable radiograph demonstrates increased opacity at the right lung base and in the retrocardiac region , which may represent atelectasis from underinflation or aspiration given the patient 's recent history . The heart size , hilar and mediastinal contours are normal . No pleural abnormality is seen .
    OUTPUT:
    
Slightly underinflated lungs with bibasilar airspace opacities which may represent atelectasis or aspiration .