Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval increase in size of the cardiomediastinal shadow . Vascular congestion . Interstitial edema . Atelectatic changes in the medial aspects of the lower lung zones ( left slightly more than right ) . No large effusions .
    OUTPUT:
    
Interval increase in size of the cardiac shadow with associated pulmonary edema suggest either cardiac decompensation or fluid overload . No obvious airspace consolidation or abscess formation .