Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior radiograph , there are new bibasilar opacities , worse on the left , which in the setting of vomiting may represent aspiration . Alternatively , this may represent multifocal pneumonia given the appropriate clinical setting . Cardiomediastinal contour is normal . No pleural effusion or pneumothorax .
    OUTPUT:
    
Bibasilar airspace opacities may represent aspiration , particularly in the setting of vomiting . Alternatively , this may represent pneumonia .