Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is unchanged retrocardiac opacification . Bilateral pleural effusions , moderate on the left and small on the right are unchanged . No pneumothorax or pneumomediastinum is evident . Mediastinal contours appear within normal limits given recent cardiac surgery . There is no radiographic evidence of developing mediastinal hematoma . Median sternotomy wires appear intact . There is no interstitial edema .
    OUTPUT:
    
1 . Unchanged retrocardiac opacity and bilateral pleural effusions , left greater than right . No significant interval change compared to recent prior examination . 2 . No new mediastinal widening to suggest hematoma