Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate left central venous catheter with subclavian approach projecting over distal SVC . There is no pneumothorax . Lungs appear hyperinflated . Diffuse emphysema is noted extending into lower lobes . Heterogeneous opacity in the right lung base has resolved . Linear opacity in the right lung base persists . Small right - sided pleural effusion is no longer visualized . There is no left pleural effusion . Hilar and mediastinal silhouettes are unremarkable . Heart size is normal . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
1 . Heterogeneous right lung base opacity has largely resolved . Linear opacity in the right lung base may represent residual pneumonia or atelectasis . 2 . Diffuse emphysema extending into lung bases , compatible with the patient 's reported history of alpha - 1 antitrypsin deficiency .