Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate a left chest wall pacemaker generator with appropriately positioned right atrial and ventricular leads . Cardiac size is normal . Hilar and mediastinal contours are within normal limits , and a calcified aortic knob is seen . The lungs are clear and mildly hyperinflated . No pleural effusion or pneumothorax . Mild biapical scarring is noted .
    OUTPUT:
    
No acute cardiopulmonary process .