Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval development of prominent interstitial markings , perihilar opacities and moderate bilateral pleural effusions consistent with pulmonary edema . The aortic knob is calcified . The heart size is normal . There is no pneumothorax .
    OUTPUT:
    
Moderate pulmonary edema and small bilateral pleural effusions are new since ___ .