Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are decreased compared to the prior exam . Heart size remains within normal limits . Mediastinal contour is unchanged . Within the right upper lobe and perihilar region , there is chronic opacification compatible with radiation fibrosis . Mild pulmonary edema is demonstrated with perhaps slight enlargement of a moderate size right pleural effusion which is partially loculated superiorly and medially . Right basilar opacification may reflect atelectasis but infection is not excluded . No pneumothorax is seen .
    OUTPUT:
    
Mild pulmonary edema with moderate right pleural effusion , perhaps slightly increased compared to the prior study . Chronic opacity within the right upper lobe and perihilar region is compatible with radiation fibrosis . Right basilar opacity may reflect atelectasis but infection is not completely excluded .