Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Diffuse increase in interstitial markings bilaterally suggests mild to moderate interstitial edema versus less likely atypical infection . No pleural effusion or pneumothorax is seen . The cardiac silhouette is mildly enlarged . Mediastinal contours are stable .
    OUTPUT:
    
Mild to moderate interstitial edema versus much less likely atypical infection .