Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior radiograph , there has been slight improvement in small bilateral pleural effusions . The left lung has re-expanded . There is no pneumothorax . The lungs are otherwise clear . Cardiomediastinal silhouette is stable . Median sternotomy wires are intact . There is no evidence of hemothorax .
    OUTPUT:
    
No pneumothorax . Slightly improved small bilateral pleural effusions .