Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A new right lower chest tube has been placed which ends as a pigtail within the lower right hemithorax . There is a persistent moderate - to - large right - sided pleural effusion , but substantially reduced . Associated parenchymal opacity suggests persistent partial atelectasis of the right lung . Leftward shift of mediastinal structures has resolved . There is no definite pleural effusion on the left .
    OUTPUT:
    
Status post pigtail catheter placement . No evidence for pneumothorax . Substantial decrease in right - sided pleural effusion .