Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral pleural drains are in unchanged in position . No pneumothorax is identified . There are persistent small bilateral pleural effusions . Central parenchymal opacities have slightly improved since the prior exam , likely due to a reduction in the amount of pleural fluid . A linear opacity in the left upper lung zone is unchanged . There is no new opacity . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Unchanged position of the bilateral pleural drains with a slight decrease in the amount of pleural fluid . Otherwise , unchanged radiograph , including a persistent left upper lung zone opacity .