Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged but unchanged . The mediastinal contours are similar . There is no overt pulmonary edema . Patchy opacities are noted at the lung bases , more pronounced on the left . No pleural effusion or pneumothorax is present . Levoscoliosis of the thoracic spine is noted .
    OUTPUT:
    
Patchy bibasilar airspace opacities , more pronounced on left , which may reflect aspiration pneumonia .