Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post right middle lobectomy . Surgical clips seen at the right hilum and mild right - sided volume loss is identified . There is a small right sided pleural effusion , there is no visualized pneumothorax . The left lung is clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Postoperative changes of right middle lobectomy . Small persistent right pleural effusion . No superimposed acute cardiopulmonary process .