Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient has known pulmonary metastases more conspicuous on the prior study . No pleural effusion or pneumothorax is seen . The cardiac silhouette remains enlarged . The cardiac and mediastinal silhouettes are stable . The patient is status post median sternotomy . There is possible mild pulmonary vascular congestion , not significantly changed from prior study .
    OUTPUT:
    
Known pulmonary metastases . Possible mild superimposed vascular congestion .