Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest wall pacer has leads in the right atrium , right ventricle and projecting over the left ventricle in stable position . Enteric tube courses into the stomach and beyond the field of view . Lung volumes remain low with mild pulmonary edema slightly improved from prior . Mild atelectasis at the left base is unchanged . There is no pneumothorax .
    OUTPUT:
    
Mild pulmonary edema is slightly improved since the study of ___ .