Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly persists . Aortic knob is calcified , and mediastinal contours are unchanged . Perihilar haziness with vascular indistinctness and mild interstitial pulmonary edema appears slightly improved compared to the prior study . Trace bilateral pleural effusions are present , without interval change in size . No pneumothorax is detected . Old rib fractures are again noted .
    OUTPUT:
    
Mild interstitial pulmonary edema , improved compared to the prior study , with small bilateral pleural effusions .