Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacer device is grossly stable in appearance . No significant change since the prior study . The cardiac and mediastinal silhouettes are stable . No new focal consolidation is seen . Possible left base atelectasis . There is no pleural effusion or pneumothorax . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
No significant interval change . No pulmonary edema or pleural effusion seen .