Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the immediate prior study , there is significant improvement in bilateral pulmonary edema , now mild . There is a persistent opacification of the left lung base , likely due to a left pleural effusion . The right IJ central venous catheter ends in the cavoatrial junction . The heart is stably enlarged .
    OUTPUT:
    
1 . Significant interval improvement in bilateral pulmonary edema , now mild . 2 . Persistent left lung base opacification , likely small pleural effusion .