Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left pectoral pacemaker has a lead with two electrodes located terminating superior to right atrium and at right ventricle . Right internal jugular Swan - Ganz catheter appears to terminate in the central right pulmonary artery . Mild pulmonary edema is slightly improved . There is no large pleural effusion . Severe cardiomegaly is unchanged .
    OUTPUT:
    
Mild pulmonary edema is slightly improved .