Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate evidence of prior lobectomy . There has been volume loss within the left hemithorax with resultant leftward shift of the mediastinum . The right lung is clear . There is a small - to - moderate left pleural effusion , which is new compared to prior film . No pneumothorax is evident . Unchanged nondisplaced fifth rib fracture . Surgical clips are noted .
    OUTPUT:
    
Stable postoperative changes with new small - to - moderate left pleural effusion .