Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volume is lower with persistent left upper lobe large opacification in area of previous surgery , likely scarring . There are no sign of new consolidation . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
No sign of acute cardiopulmonary process . Persistent left apical scarring after lung surgery .