Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Monitoring and supporting devices are in standard position . Mild to moderately severe pulmonary edema has symmetrically improved on the right side , but unchanged on the left side . Bilateral small pleural effusions are presumed . Retrocardiac density is increased since ___ , reflecting an increased left lower lung atelectasis . There is no pneumothorax .
    OUTPUT:
    
Over last 24 hours mild to moderately severe pulmonary edema has symmetrically improved on the right side and unchanged on the left side . Bilateral small pleural effusions are presumed .