Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Left - sided chest tube is noted with tip projecting over the left upper lung field . Small amount of subcutaneous emphysema is demonstrated within the left lateral chest wall . No pneumothorax is clearly visible on this exam . Heart size is accentuated due to low lung volumes , but likely mildly enlarged . The mediastinal and hilar contours are unremarkable . Crowding of the bronchovascular structures is noted . Small left pleural effusion is demonstrated . Bibasilar airspace opacities , more pronounced in the retrocardiac region , may reflect atelectasis though infection is not excluded . There are no acute osseous abnormalities detected .
    OUTPUT:
    
1 . No definite pneumothorax seen on this single semi upright AP view . Left chest tube in place with a small amount of subcutaneous emphysema in the left lateral chest wall . 2 . Low lung volumes with bibasilar airspace opacities , likely atelectasis , but infection is difficult to exclude . Small left pleural effusion .