Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small left apical pneumothorax is stable . Left chest tubes are in unchanged position . Small amount of left chest wall subcutaneous emphysema is stable . There is improved aeration of left lower lobe with residual atelectasis . Cardiac silhouette is normal size and unchanged . Subtle
    OUTPUT:
    
Stable small left apical pneumothorax . Improved left lower lobe aeration .