Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New left pigtail drain is in place in the left lower hemithorax . Previously seen small pleural effusions has decreased in size . Parenchymal opacity within the left mid lung persists . The right lung is clear . No right pleural effusion . No pneumothorax . Mediastinal and hilar contours are normal .
    OUTPUT:
    
Decrease in left pleural effusion status post left pigtail catheter placement . Overlying parenchymal opacities are unchanged .