Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study , there has been no significant change . Postoperative changes are again noted in the left hilum and upper mediastinum . There is no pneumothorax , pleural effusion , pulmonary edema , or focal consolidation . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
No acute cardiopulmonary process .