Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest provided . The intervally new right chest wall AICD is seen with 2 leads seen extending into the right atrium and right ventricle . Left - sided leads are also seen extending into the right heart . Cardiomegaly is again noted with stable mediastinal contour . Mild hilar congestion is likely present without frank pulmonary edema . No pleural effusion or pneumothorax . No free air below the right hemidiaphragm is seen . Osseus structures appear intact .
    OUTPUT:
    
Stable cardiomegaly . Interval exchange of right chest wall pacer device with leads coursing into the region of the right atrium and right ventricle .