Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is interval enlargement of the left pneumothorax . Minimal left basilar atelectasis and blunting of left costophrenic angle . The right lung is clear . The size of the cardiomediastinal silhouette is within normal limits . The mediastinal structures remain midline .
    OUTPUT:
    
Interval increase in size of the left pneumothorax without evidence of tension .