Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is persistent flattening and scarring at the left lung base , with postsurgical changes seen status post thoracotomy . No focal consolidation , pleural effusion , evidence of a pneumothorax is seen . The cardiac and mediastinal silhouettes are stable and unremarkable . Surgical clips are noted projecting over the left upper quadrant .
    OUTPUT:
    
No acute cardiopulmonary process .