Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval development of bilateral perihilar airspace opacities . There is no pleural effusion . No pneumothorax . There is mild enlargement of the cardiopericardial silhouette .
    OUTPUT:
    
Findings suggestive of pulmonary edema , but a superimposed infectious process can not be ruled out . Reviewed with Dr . ___