Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the previous radiograph , a right pleural drain was placed . There is no evidence of pneumothorax . The pre-existing moderate right pleural effusion has substantially decreased in extent . As a consequence , the pre-existing right basilar atelectasis have also decreased . Unchanged normal appearance of the cardiac silhouette . Unchanged appearance of the mediastinum and of the left lung .
    OUTPUT:
    
Substantially decrease of right pleural effusion and subsequent atelectasis of the right pleural drain placement .