Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . There are low lung volumes . Left basilar atelectasis is seen . No definite focal consolidation is seen . There is no large pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Low lung volumes and left basilar atelectasis . No definite acute process .