Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval removal of an endotracheal tube and nasogastric tube . Lung volumes are low causing crowding of the bronchovascular structures . The patient is status post median sternotomy and CABG . No definite focal consolidation or pleural effusion is seen .
    OUTPUT:
    
Low lung volumes without acute cardiopulmonary process .