Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable erect frontal chest radiograph demonstrates a right internal jugular approach central catheter and aortic stent , unchanged in position . There has been interval extubation . Marked interstitial lung markings are increased , suggestive of mild pulmonary edema superimposed on existing emphysema . There is no appreciable focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
Increased interstitial lung markings , suggestive of mild pulmonary edema superimposed on existing emphysema .