Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable , with mild exaggeration of the heart size due to low lung volumes . No pleural effusion is seen . A small left apical pneumothorax was not seen in the prior CXR . A left chest tube is in place , coursing through the left upper lobe on the prior OSH CT . Mild bibasilar atelectases are seen , left greater than right . No obvious displaced rib fractures are seen . Mild subcutaneous emphysema is seen in the left lower chest wall .
    OUTPUT:
    
Small left apical pneumothorax . Left chest tube in similar location , coursing through the left upper lobe .