Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate new widespread but heterogeneous interstitial abnormality , which is worrisome for pulmonary edema superimposed on a background of normal lung tissue , noting a previous chest CT that showed substantial emphysema . Perhaps less likely consideration would be atypical pneumonia , which could be considered clinically . There is no pleural effusion or pneumothorax . The cardiac , mediastinal , and hilar contours appear unchanged .
    OUTPUT:
    
New moderate heterogeneous interstitial abnormality , for which interstitial pulmonary edema should be considered . Perhaps less likely , the appearance could reflect atypical infection in the appropriate setting .