Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . There has been interval development of a dense , retrocardiac opacity which silhouettes the descending aorta , concerning for left lower lobe consolidation . Redemonstrated is a persistent opacity within the right middle lobe , unchanged since ___ , which may represent a focus of infection versus focal atelectasis . Small , bilateral pleural effusions are noted again . There is no pneumothorax . The heart appears mildly enlarged , although this may be exaggerated by the AP projection and retrocardiac airspace disease . Median sternotomy wires appear intact and well aligned . No acute bony abnormality is detected .
    OUTPUT:
    
1 . Interval development of a retrocardiac airspace opacity , concerning for new left lower lobe pneumonia . Recommend further evaluation with true PA and lateral chest radiographs . 2 . Unchanged right middle lobe airspace opacity , unchanged since ___ . Findings may be compatible with persistent pneumonia versus focal atelectasis . Followup after treatment is suggested to confirm resolution .