Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided Port - A - Cath tip terminates in the lower SVC . The patient is status post median sternotomy and CABG . There are low lung volumes . The heart size is normal . Mediastinal and hilar contours are within normal limits . There is minimal atelectasis in the lung bases . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities are present .
    OUTPUT:
    
Mild bibasilar atelectasis in the setting of low lung volumes .