Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the chest radiographs obtained in approximately ___ year prior , there is a new fracture of the superior most median sternotomy wire . Other median sternotomy wires appear unchanged , with an old fracture of the second median sternotomy wire . Lungs are fully expanded and clear without consolidations or suspicious pulmonary nodules . No pleural abnormalities . Heart size is normal . Cardiomediastinal and hilar silhouettes are normal .
    OUTPUT:
    
No radiographic evidence of pneumonia or other significant cardiopulmonary abnormalities . New median sternotomy wire fracture as described above , concerning for sternal instability . Failure of the sternumto fuse postoperatively is appreciated on recent CT chest dated ___ .