Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study , there has been interval retraction of the right internal jugular central venous catheter , which now terminates in the low SVC . The lungs are hyperinflated , with slightly improved aeration of the right lung base since the prior study . Bilateral emphysematous changes are stable . There is no over pulmonary edema or pneumothorax . The cardiomediastinal silhouette is unremarkable . Nodular opacity in the right lung base is noted .
    OUTPUT:
    
1 . Right internal jugular central venous line is in appropriate position , terminating in the low SVC . 2 . Improved aeration of the right lung base since the prior study . 3 . Severe emphysema . 4 . Right basilar opacity likely represents overlapping structures rather than a discrete pulmonary nodule , however attention on follow - up imaging is recommended .