Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours stable . There is no pneumothorax . There may be a small left pleural effusion , but there is no right pleural effusion . The lungs are well - expanded without focal consolidation concerning for pneumonia . Mild interstitial edema similar to the prior study .
    OUTPUT:
    
Mild interstitial edema .