Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior chest radiograph of ___ the previously identified bilateral lower lobe opacities . Effusions are no longer clearly identified . There is no new focal opacity . No pulmonary edema or pneumothorax . The cardiac and mediastinal contours are stable .
    OUTPUT:
    
Interval improvement but persistence of bibasilar opacities .