Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac size is normal . The ascending aortic silhouette is mildly prominent . Lung volumes are slightly low , causing bronchovascular crowding . However , no focal consolidation , pleural effusion , or pneumothorax . No evidence of free subdiaphragmatic air on this partially upright view .
    OUTPUT:
    
No evidence of free subdiaphragmatic air . However , since this is not a completely upright view , free air can not be excluded .