Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate median sternotomy wires , the most superior appears to be broken . There is mild cardiomegaly without pulmonary vascular congestion , pleural effusion , or interstital edema . The lungs are clear . The cardiac contours are within normal limits .
    OUTPUT:
    
1 . Mild cardiomegaly without evidence of pulmonary edema . 2 . Broken superior - most median sternotomy wire .