Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . Multiple mediastinal surgical clips are compatible with CABG surgery . The cardiac silhouette is moderately to severely enlarged , as before . The thoracic aorta is tortuous , result in prominence of the mediastinum and rightward deviation of the trachea . Mild pulmonary vascular congestion is unchanged with slightly improved pulmonary edema from ___ . No large pleural effusion or pneumothorax is seen . The lung volumes are decreased .
    OUTPUT:
    
1 . Low lung volumes . 2 . Mildly improved pulmonary edema and unchanged vascular congestion from ___ .