Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Vascular stent remains in place within the thoracic aorta , similar in appearance to recent radiograph . Heart size and aortic contour are unchanged . Interval decrease in extent of interstitial edema . Small bilateral pleural effusions appear slightly increased , and are associated with adjacent bibasilar atelectasis . Hyper expansion of the lungs suggests the possibility of underlying COPD .
    OUTPUT:
    
Improving interstitial edema . Small pleural effusions .