Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior exam , there hilar vasculature has increased in size . There is also slightly worsening of the interstitial edema . There is no pleural effusion or pneumothorax . The mediastinal contours are unchanged . The heart size remains moderately enlarged . Sternal wires are intact .
    OUTPUT:
    
Interval worsening of the mild - to - moderate pulmonary edema . Unchanged cardiomegaly .