Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP radiograph of the chest . Moderate to marked cardiomegaly appears slightly increased . . A triple lead pacer device is unchanged in position overlying the left chest wall . The leads overlie the expected locations of the right atrium , right ventricle , and coronary sinus . The lungs are clear . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Clear lungs . 2 . Moderate to severe cardiomegaly appears slightly increased . No pulmonary edema .