Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Cardiomediastinal silhouette and hilar contours are normal . Trace linear opacities in the lingula as well as left lung base opacities are re - demonstrated . Right lung is clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
Re - demonstration of a subtle lingular opacities and left lung base opacities similar to yesterday 's examination which could represent infection in the appropriate clinical circumstance .