Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent scarring at the right lung base which has not significantly changed in association with a small effusion . Moderate sized left pleural effusion has increased since prior chest x-ray but is similar compared to prior chest CT from ___ . Retrocardiac opacity may also be due to effusion and atelectasis . More superiorly , the lungs are clear , there is no edema . The cardiomediastinal silhouette is stable . No acute osseous abnormalities .
    OUTPUT:
    
Chronic changes in the right lung including scarring and effusion . Moderate left pleural effusion as seen on chest CT from ___ . No pulmonary edema .