Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a left chest wall pacer device with leads overlying the right atrium and ventricle , unchanged . There is unchanged moderate cardiomegaly . Lung volumes are slightly improved compared to chest radiograph from the day prior , with unchanged bibasilar atelectasis and vascular congestion . There may be a small left pleural effusion . No pneumothorax is present . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Unchanged chest radiograph , with moderate cardiomegaly , bibasilar atelectasis , and vascular congestion .