Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated . Increased heterogeneous granular opacities within bilateral lung bases . Lucencies projecting along the right costophrenic angle and along lateral right pleural surface may represent blebs . Pleural plaques again noted . There is evidence of severe emphysema . Persistent moderate left basilar pneumothorax . No pleural effusion . No significant change since prior examination . Heart size , mediastinal contour , and hila are unremarkable . Aortic arch calcifications are present . A right anterior chest wall pacer device with single lead tip within the right ventricle .
    OUTPUT:
    
1 . Stable moderate left basilar pneumothorax . 2 . Evidence of severe emphysema with right costophrenic and lateral right pleural blebs . 3 . Increased bibasilar opacities are worrisome for aspiration or aspiration pneumonia . 4 . Pleural plaques consistent with prior asbestosis exposure .