Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The position of the port and pigtail catheter remains unchanged since previous study . The heart and mediastinum appear to be stable . Known calcified mediastinal lymph nodes . The appearance of the lungs is perhaps marginally better , but overall remains unchanged compared to the prior study . Small bilateral pleural effusions . No pneumothorax .
    OUTPUT:
    
No significant changes compared to the prior study .