Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior , the right - sided pigtail catheter is no longer visualized . Size of the right pleural effusion seen laterally and superiorly is not significantly changed given differences in technique . Underlying parenchymal opacities are also unchanged . Rightward mediastinal shift is again noted . Left lung remains clear . No acute osseous abnormalities .
    OUTPUT:
    
Interval removal of right - sided chest tube since ___ without other change .