Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The tip of an accessed right pectoral MediPort projects over the low SVC . There is no pneumothorax . Prominent bilateral interstitial lung markings likely correspond in part to the patient 's known severe emphysema . However , increased prominence of the interstitial markings bilaterally may be due to superimposed edema or infection .
    OUTPUT:
    
Chronic interstitial changes of emphysema with increased interstitial opacities , which may be due to superimposed infection or edema .