Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low , with bibasilar atelectasis , but no focal consolidation . Mild increase in the cardiomediastinal silhouette since ___ . Coronary artery bypass grafting , with mediastinal clips and median sternotomy wires . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
Slight enlargement in the cardiomediastinal silhouette . Although this could be due to increased mediastinal fat , please correlate clinically for evidence of acute aortic syndrome . This was discussed with Dr . ___ ___ on ___ at 9 : 25 a .m .