Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable including mild - to - moderate cardiomegaly . There is no pleural effusion or pneumothorax . The prominence of the interstitium has increased suggesting mild pulmonary edema superimposed on patchy opacities in both upper lungs that persist but with shifeing morphology , possibly due to scarring or atelectasis , but a relatively new finding , not present on remote prior films .
    OUTPUT:
    
1 . Findings suggesting mild pulmonary edema . 2 . Persistent upper lobe opacities with mixed nodular and streaky morphologies , probably scarring but not present on remote prior films . Accordingly , it may be appropriate to consider follow - up radiographs within ___ months to show stability of this appearance .