Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left - sided chest tube , which appears unchanged in orientation in comparison to the prior chest radiograph . There is a small amount of subcutaneous emphysema , but no evidence of pneumothorax . There is also small amount of left apical pleural thickening , which is likely postoperative . There is a small left - sided pleural effusion with compressive atelectasis , which is unchanged . The lungs are otherwise clear . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There are no acute osseous abnormalities . A G tube is seen projecting over the left upper abdomen .
    OUTPUT:
    
1 . Appropriate positioning of a left - sided chest tube without evidence of pneumothorax . 2 . Small left pleural effusion with compressive atelectasis , unchanged .