Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a left chest wall pacemaker with a single atrial lead following the expected transsubclavian course . There is no pneumothorax . There is no focal consolidation , pleural effusion , or pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
1 . Interval placement of a left chest wall pacemaker . 2 . No evidence of acute cardiopulmonary process .