Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate left , mostly anterior , pneumothorax is unchanged compared to ___ study though there is increased subcutaneous air of the left chest wall and shoulder . No mediastinal shift is seen . The cardiac silhouette is normal . The lungs are hyperinflated with flattening of the hemidiaphragms . Left upper lung previously fluid - filled cystic abnormality is now evacuated and not present on today 's study . The small left pleural effusion is stable . The right lung is clear .
    OUTPUT:
    
Stable left apical pneumothorax with increased subcutaneous air of the left chest wall stable . Complete involution of previously seen cystic abnormality and stable left pleural effusion .