Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no free air under the diaphragm . Lung volumes are low and there is bibasilar atelectasis . No focal consolidation , pleural effusion , or pneumothorax . Widening of the mediastinum is not entirely explained by low lung volumes and technique , and is of indeterminate chronicity .
    OUTPUT:
    
1 . No evidence of free subdiaphragmatic gas . 2 . Mediastinal widening can be further evaluated with CT if clinically indicated .