Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate clear lungs and normal hilar and cardiomediastinal contours . There is no pneumothorax or pleural effusion . The pulmonary vascularity is normal . An implanted transvenous pacer / defibrillator is unchanged and longstanding breakage of the fourth sternal cerclage wire from the top is noted .
    OUTPUT:
    
No evidence of congestive heart failure .