Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lordotic positioning . Again seen is a left chest tube and left - sided pigtail catheter , similar in configuration . Also again seen is considerable left - sided subcutaneous emphysema . No gross left - sided pneumothorax is detected . However , linear air is seen in close proximity there the aorta and cardiac border raising the question of a small amount of pneumothorax air along the medial side of the lung versus a small pneumomediastinum . The cardiac silhouette itself is grossly unchanged . 2 small metallic densities overlie the cardiac silhouette -- these appear to correspond to endobronchial valves seen in left lower lobe bronchi on the CT from ___ . Minimal increased retrocardiac density could reflect atelectasis . No gross left effusion . Again seen is relative lucency at the right lung base , which likely reflects emphysematous change . No convincing right - sided pneumothorax . Minimal platelike atelectasis again seen in the right mid zone , but no frank infiltrate . No right - sided effusion . Upper zone redistribution , without overt CHF .
    OUTPUT:
    
Thin vertical linear lucency along the left heart border could represent either a small left - sided pneumothorax along the medial side of the lung or possibly new small amount of mediastinal air . Clinical correlation is requested . Otherwise , no obvious left - sided pneumothorax , but a tiny apical pneumothorax may be difficult to detect due to overlying subcutaneous emphysema . Upper zone redistribution , without overt CHF . Minimally increased retrocardiac density could reflect atelectasis . Subtle metallic densities overlying left heart border could represent endobronchial valves seen in left lower lobe bronchi on ___ CT scan .