Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate well - expanded , clear lungs . Mild cardiomegaly is stable . Pacer leads are again seen extending to the right atrium and apex of the right ventricle with an additional lead in the region of the coronary sinus . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Stable appearance of pacer leads in the right atrium , right ventricle extending to the apex , and in the region of the coronary sinus .