Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a persistent right mid lung masslike opacity , slightly decreased in extent when compared to the prior study . There is a small left and moderate right pleural effusion , increased opacity at the right lung base likely reflects a combination of pleural fluid and a atelectasis . Left lung appears grossly clear . No pneumothorax seen . The cardiomediastinal contour is unchanged with persistent cardiomegaly and calcification of the mitral valve annulus .
    OUTPUT:
    
Small left and moderate right pleural effusions . A atelectasis in the right middle lobe . A slight interval improvement in the masslike opacity in the right mid lung .