Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left porta cath is in constant position . There is a new stent in the right bronchus intermedius . Since the study earlier today there may be slightly improved aeration of the right lower lobe . Extensive right upper lobe opacity is otherwise unchanged representing known mass and pleural effusion . There is no evidence of pneumothorax . The heart is not enlarged .
    OUTPUT:
    
No pneumothorax . Persistent opacification of the right upper hemithorax .