Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the most recent study , the heart is slightly larger and there are increased perihilar and bibasilar interstitial opacities , consistent with mild pulmonary edema . There is no focal consolidation . A small left pleural effusion is probably unchanged . No pneumothorax .
    OUTPUT:
    
1 . Interval development of mild pulmonary edema . 2 . Stable small left pleural effusion .