Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The small left apical pneumothorax is unchanged in appearance . There is a prominent air - fluid level on the left side consistent with moderate pleural effusion . Subcutaneous air in the left chest wall is unchanged in appearance . Again seen is substantial atelectasis at the left base , which is unchanged . The right lung is clear .
    OUTPUT:
    
1 . Small left apical pneumothorax is unchanged in appearance . 2 . Prominent air-fluid level on left side consistent with moderate pleural effusion .