Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small - to - moderate left pneumothorax whose apical border has risen from the level of the fourth posterior rib to the third posterior interspace , is minimally smaller . The anterior component of the pneumothorax is unchanged . Mild - to - moderate right lower lung atelectasis has changed in distribution , more pronounced at the base , but not in overall severity . Substantial left basilar atelectasis persists . Subcutaneous emphysema is unchanged . There are no areas of focal consolidation concerning for infection .
    OUTPUT:
    
1 ) Slightly reduced , small to moderate left pneumothorax . 2 ) Unchanged mild - to - moderate right lower lung atelectasis and substantial left basilar atelectasis . 3 ) No pneumonia .