Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new chest tube projecting over the left hemithorax . Although there is still a large left - sided pneumothorax , rightward shift of mediastinal structures is partly resolved . There is a coinciding trace pleural effusion . The right lung remains clear .
    OUTPUT:
    
Status post chest tube placement with reduction in the extent of mediastinal shift , but persistent large pneumothorax and mild shift .