Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . There has been interval increase in bibasilar opacities , particularly on the right which could be due to aspiration and / or infection . Slight blunting of the costophrenic angles are seen , and trace pleural effusions may be present and / or pleural thickening . No pneumothorax . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Increasing bibasilar opacities may be due to aspiration and / or infection . No overt pulmonary edema .