Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left apical pneumothorax is once again present and largely unchanged in size . The right lung is again clear . The remainder of the left lung is again clear . The cardiomediastinal silhouette is unremarkable . No new findings are seen .
    OUTPUT:
    
Continued small left apical pneumothorax , stable in size from the prior examination .