Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accentuating the cardiomediastinal silhouette and interstitial opacities . However , increased interstitial opacities prior likely due to pulmonary edema . Ill - defined opacities in the right upper lobe may represent pneumonia . Right middle and lower lobe as well as left lower lobe opacities are likely due to atelectasis . Heart size is mildly enlarged . Mediastinal and hilar contours are unchanged . There is no evidence for pleural effusion , or pneumothorax .
    OUTPUT:
    
1 . Possible right upper lobe pneumonia . 2 . Mild pulmonary edema .