Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate stable right internal jugular approach central venous catheter with tip in the upper SVC . Median sternotomy wires are intact . Patient is status post aortic valve replacement with trace expected pneumopericardium . Post - surgical cardiomediastinal widening is stable since four days prior . The lungs are clear . There is no pneumothorax or pulmonary vascular congestion . Trace pleural effusion layers along the posterior costophrenic recess .
    OUTPUT:
    
No significant interval change .