Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study performed nine hours earlier , there has been interval increase in density of the bibasilar opacities which likely represent aspiration pneumonia superimposed on chronic scarring and atelectasis at these locations . The upper lung fields are clear . There is no mediastinal widening . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
Aspiration pneumonia superimposed on chronic bibasilar lung scarring and atelectasis .