Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there is stable cardiomegaly with vascular congestion and moderate asymmetric pulmonary edema , right greater than left . A retrocardiac opacity likely represents atelectasis and possible pleural effusion , however may represent pneumonia in the appropriate clinical setting . No Pneumothorax . A three - lead pacemaker device appears unchanged in position .
    OUTPUT:
    
Cardiomegaly with vascular congestion and moderate asymmetric pulmonary edema , right greater than left . Retrocardiac opacity likely represents atelectasis and possible pleural effusion , however in the appropriate clinical setting , pneumonia can not be excluded .