Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large right hydropneumothorax is noted , with a substantial fluid component . No shift of midline structures is identified to indicate tension . There is atelectasis of the right lung , with the left lung appearing grossly clear . No left - sided pleural effusion or pneumothorax is identified . Heart size appears normal and the mediastinal contours are unremarkable . No pulmonary edema is present . No acute osseous abnormalities are detected .
    OUTPUT:
    
Large right hydropneumothorax without shift of midline structures .