Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to previous radiograph , there has been interval removal of left pleural and mediastinal drains with persistent right venous introduction sheath . There is persistent unchanged right upper lobe atelectasis with low lung volumes . There are no new focal consolidations . No overt pleural effusions or pulmonary edema . There is no pneumothorax .
    OUTPUT:
    
No significant change .