Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . No pleural effusion or pneumothorax . The cardiopericardial silhouette is borderline enlarged . A dual lead pacemaker is seen with leads in appropriate position . There is cortical irregularity of the left lower lateral ribs , likely chronic fractures .
    OUTPUT:
    
No significant intrathoracic abnormality . Reviewed with Dr . ___ .