Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . No focal consolidation , pleural effusion , or pneumothorax identified . Cardiomediastinal silhouette is unchanged . Compared with the prior radiograph , there is pulmonary vascular congestion . Fusion hardware of the cervical spine is unchanged .
    OUTPUT:
    
Mild pulmonary vascular congestion .