Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An airspace opacity in the left mid lung likely reflects re-expansion of the previously demonstrated platelike atelectasis . The left - sided pleural effusion is similar in appearance when compared to the prior study , although the loculated interstitial portion is less . There is persistent left lower lobe atelectasis . The right lung remains clear . No pneumothorax seen . Hardware related to posterior thoracic spine stabilization and corpectomy is unchanged in appearance . Prior resection of the left eighth rib and old healed fractures of the left fifth rib are similar in appearance .
    OUTPUT:
    
Slight interval improvement in the loculated pleural effusions with new airspace opacity in the left lung likely due to re-expansion . Infection can not be excluded and continued attention on followup is recommended .