Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are moderately hyperexpanded with relative lucency of the apices consistent with the diagnosis of emphysema and COPD . There is blunting of the left costophrenic angle in this patient with history of left lower lobectomy , the result of scar . The lungs are clear without focal consolidation , pleural effusion , or pneumothorax . The cardiac silhouette is normal in size . The mediastinal contours are normal , known calcified lymph nodes from prior granulomatous infection are not well seen .
    OUTPUT:
    
Postoperative changes of left lower lobectomy , without acute chest abnormality .