Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest tube is noted projecting over the left upper lung . No sizeable residual pneumothorax . Triangular opacity in the left midlung could represent a combination of pleural scarring and atelectasis . The left lung base is opacified , likely the combination of pleural fluid and atelectasis . There is mild vascular congestion . Opacification of the retrocardiac region may represent a hiatal hernia . Heart size is mildly enlarged .
    OUTPUT:
    
1 . Left chest tube projecting over the left upper lung . 2 . No appreciable residual left pneumothorax . 3 . Scarring and pleural thickening at the left lung base .