Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior exam , there has been development of new moderate pulmonary edema . A retrocardiac opacity likely represents atelectasis . There is no definite pleural effusion , though a small left one can not be excluded due to obscuration of the left costophrenic angle by the heart . There is no pneumothorax . The mediastinal contours are normal . The heart is severely enlarged , and unchanged from the prior exam . A left - sided pacemaker is unchanged .
    OUTPUT:
    
Moderate pulmonary edema and severe cardiomegaly .