Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior study , there has been interval improvement in interstitial pulmonary edema , which is now minimal . The cardiomediastinal silhouette is stable . There is no pleural effusion , pneumothorax , or focal airspace opacity .
    OUTPUT:
    
Improved interstitial edema since the prior study , which is now minimal .