Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The large right superior mediastinal mass extending into the right hemithorax is unchanged . Tracheostomy tube in situ . Right main bronchus stent is unchanged . Feeding tube in situ . Right - sided pigtail catheter in situ with no visualized right - sided pleural effusion . Minor left - sided pleural effusion with adjacent atelectatic changes appear similar compared to previous imaging .
    OUTPUT:
    
No significant interval change .