Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Re - demonstrated is unchanged moderate interstitial pulmonary edema superimposed upon patient 's underlying chronic lung disease . Overall increased density of the lung bases is likely secondary to attenuation artifact due to the patient 's body habitus . No confluent consolidation is identified . There is no pneumothorax . Cardiomediastinal and hilar contours remain mildly enlarged , though unchanged from prior .
    OUTPUT:
    
Persistent moderate interstitial pulmonary edema .