Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest wall dual lead pacing device is again seen . Linear opacity in the left midlung is most suggestive of atelectasis . The lungs are otherwise clear without effusion , consolidation or edema . The cardiomediastinal silhouette is within normal limits . Median sternotomy wires are again noted . No acute displaced fractures are seen . Proximal left humeral and left lateral fourth rib fractures are chronic .
    OUTPUT:
    
No acute cardiopulmonary process .