Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left chest tube is unchanged in positioning . The size and distribution of the moderate - sized loculated left pleural effusion is unchanged . The right lung is clear . The pulmonary vasculature is normal . The upper mediastinum is stable in size , however the cardiac silhouette can not be entirely evaluated due to the pleural effusion . There is no pneumothorax . The linear radiodensity projecting over the left mid lung is likely external to the patient .
    OUTPUT:
    
1 . Unchanged positioning of left chest tube . 2 . Stable moderate - sized loculated left pleural effusion .