Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a pigtail catheter with subsequent drainage of the left pleural effusion , which is now small . There is a new tiny left apical pneumothorax . Nodular left upper lobe , right lower lobe and left perihilar opacities are unchanged . The patient has had previous right upper lobe wedge resection . Metallic spinal fusion hardware is partially imaged . Mild thoracic spine dextroscoliosis is unchanged .
    OUTPUT:
    
Substantial interval decrease in left pleural effusion following pigtail catheter drainage . New tiny left apical pneumothorax . Unchanged pulmonary metastases .