Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , pleural effusion , or pneumothorax . The cardiac silhouette remains mildly enlarged . The aorta is quite tortuous , though unchanged . Median sternotomy wires are stable in position and appear intact . There is a left axillary pacemaker in place , with unchanged configuration . A ventricular lead appears intact , and is unchanged in position . Prosthetic aortic valve is unchanged in appearance .
    OUTPUT:
    
No acute chest abnormality . A left axillary pacemaker is unchanged in position .