Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph again demonstrates a left chest wall pacer device with the single lead overlying the right ventricle , unchanged in position . Moderate cardiomegaly is unchanged , as is retrocardiac opacity which is likely related to atelectasis and possible small left pleural effusion . No definite focal consolidation is identified . Moderate pulmonary edema is persistent , but improved compared to the prior radiograph . There is no pneumothorax .
    OUTPUT:
    
Persistent but mildly improved moderate pulmonary edema .