Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse ground - glass opacity throughout the left upper lung zone is thought to reflect changes from recent ablation . There is no pneumothorax . Chain sutures are seen in the left upper lung . There is no pleural effusion . The cardiac and mediastinal contours are unchanged . There is a moderate size hiatal hernia .
    OUTPUT:
    
Post ablative changes of the left upper lung without a pneumothorax .