Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postoperative mediastinum , hila , cardiomegaly are stable from ___ . The lungs are well expanded and clear without pulmonary edema or pneumonia . No pleural effusion or pneumothorax . Partially visualized right humeral head surgical hardware is unchanged .
    OUTPUT:
    
1 . Resolution of previously pleural effusions . 2 . Stable postoperative appearance .