Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is not engorged . Lungs are hyperinflated . Streaky opacities are noted in the lung bases , which could reflect infection or aspiration . No pleural effusion or pneumothorax is detected . An inferior vena cava filter is noted projecting over the midline upper abdomen .
    OUTPUT:
    
Patchy bibasilar airspace opacities , which may reflect pneumonia or aspiration .