Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiograph obtained 4 days prior , there has been substantial improvement in pulmonary vascular congestion and resolution of pulmonary edema . Large , bilateral pleural effusions are essentially unchanged . Heart size is indeterminate given silhouetting by adjacent pleural effusions .
    OUTPUT:
    
Substantial improvement in pulmonary vascular congestion with resolution of pulmonary edema . Large , bilateral pleural effusions are unchanged .