Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes remain low , with bibasilar atelectasis . The heart is mildly enlarged , but unchanged compared to the prior study . There is no large pleural effusion or pneumothorax . Changes related to prior CABG procedure are again noted . Midline tracheostomy tube is unchanged in position . Multiple vascular calcifications project over the left upper quadrant of the abdomen .
    OUTPUT:
    
Low lung volumes and bibasilar atelectasis persist , along with mild cardiomegaly . No pneumothorax or new consolidation to suggest pneumonia .