Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior film , there has been interval improvement in the CHF / interstitial edema . Upper zone redistribution and slight vascular plethora remains visible . Again seen are small right - greater - than - left pleural effusions and underlying collapse and / or consolidation .
    OUTPUT:
    
Interval improvement in CHF / interstitial edema . Residual vascular plethora present .