Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is mild postoperative widening of the cardiomediastinal silhouette , similar to prior . Median sternotomy wires are intact . Lung volumes are low , and there is a small left basilar pleural effusion with adjacent atelectasis . The presence of low lung volumes makes it difficult to exclude mild pulmonary edema . No pneumothorax .
    OUTPUT:
    
1 . Small left basilar pleural effusion with adjacent atelectasis . 2 . Interstitial edema is mild if present .