Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior film , the left chest tube is been removed . No definite pneumothorax is identified . However , the flattened appearance of the left base opacity could reflect a subtle hydro pneumothorax . No associated lucency is identified to confirm this . Small bilateral effusions and bibasilar atelectasis are otherwise similar to the prior study . No CHF or new infiltrate is identified . Cardiomediastinal silhouette is similar in appearance .
    OUTPUT:
    
Interval removal of left chest tube . No definite pneumothorax , though flattened appearance of the left pleural effusion raises the question of occult hydro pneumothorax . If clinically indicated , a lateral view could help for further assessment . Otherwise , doubt significant interval change .