Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual lead left - sided AICD is stable in positions . Patient is status post median sternotomy and CABG . Lung volumes remain low . Subtle bibasilar opacities are felt to more likely be due to atelectasis or aspiration rather than pneumonia from infection . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . There is likely a hiatal hernia .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis or possibly aspiration . No definite focal consolidation to suggest pneumonia .