Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The mild interstitial pulmonary edema has slightly improved . The heart size is normal , and there are no pleural effusions . Mediastinal and hilar silhouette are normal . Small right effusion in the major fissure . No pneumothorax .
    OUTPUT:
    
Slightly improved interstitial pulmonary edema .