Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior CXR performed ___ , there has been interval placement of a left - sided pigtail catheter . The large left pleural effusion has decreased in size . Right lung is essentially clear , without focal consolidations or pleural effusions . No pneumothorax bilaterally . Right heart border is unremarkable . No acute osseous abnormalities .
    OUTPUT:
    
Interval placement of a left - sided pigtail catheter , with slight improvement in large left pleural effusion .