Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . The patient has had a prior left lower lobectomy with posterior rib resection and volume loss . Again noted are mediastinal surgical clips . There is no focal consolidation , pleural effusion , or pneumothorax . The heart size is normal .
    OUTPUT:
    
Stable post-operative changes from left lower lobectomy . No acute cardiopulmonary process .