Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of bilateral pigtail catheters and interval decrease in size of the bilateral pleural effusions . There is a small left apical pneumothorax , and no pneumothorax is seen on the right . The patient is status post median sternotomy , mitral valve replacement and CABG . There is no focal consolidation . .
    OUTPUT:
    
Small left apical pneumothorax . Interval decrease in bilateral pleural effusions following pigtail catheter placement .