Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a stent within the left brachiocephalic vein , as before . The cardiac , mediastinal and hilar contours appear stable . There is a moderate - sized left - sided pleural effusion with a small one on the right side , very similar to prior findings . Associated atelectatic changes are likely in the corresponding lower lobes and possibly lingula on the left , but there is balanced mass effect and lung fields appear otherwise clear . There is no pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Unchanged bilateral pleural effusions , greater on the left than right .