Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior film , the left apical pneumothorax may be very slightly larger . Left - sided chest tube is again seen , appearing straighter in its course than on the prior film . Otherwise , no significant interval change is detected . Cardiomediastinal silhouette is unchanged . No CHF , focal infiltrate , effusion , or significant atelectasis detected .
    OUTPUT:
    
Small left pneumothorax appears very slightly larger on today 's exam .