Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval insertion of a left chest tube seen projecting over the left lateral lower lung , with significant interval improvement in the size of the now with small left pleural effusion . There has been interval re-expansion of much of the left lung , which appears clear . There is some residual opacification of the left lower lung likely related to small residual hydrothorax and adjacent left lower lung relaxation atelectasis . There has been interval resolution of rightward shift of mediastinal structures , now normal in appearance and location . The right lung remains clear . There is no right pleural effusion . There is no evidence of a pneumothorax .
    OUTPUT:
    
Significant interval improvement in a now small left hydrothorax status post left chest tube insertion , with re-expansion of the left lung and resolution of rightward shift of mediastinal structures . Small residual left pleural effusion with adjacent left lower lobe relaxation atelectasis . No pneumothorax .