Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate a small - to - moderate left - sided pleural effusion , stable in size since this morning . Pulmonary edema has actually irmpvoed , particularly in the left lower lobe . Right lower lobe and retrocardiac atelectasis is present .
    OUTPUT:
    
Improving pulmonary edema .