Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior radiograph , lung volumes have increased . The degree of the bilateral pleural effusions has decreased , but are still persistent . No new focal consolidation concerning for pneumonia or pneumothorax . Cardiomediastinal and hilar contours are stable . No change in the the spinal hardware .
    OUTPUT:
    
Improved , but still persistent , bilateral pleural effusions .