Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed and compared to the prior study . Lung volumes are minimally improved , however , persistent linear opacities in the left upper and lower lung represent atelectasis . The previously noted right - sided chest tube has been removed and there is no pneumothorax or pleural effusion . Normal cardiac and mediastinal contours . Unchanged elevation of the right hemidiaphragm .
    OUTPUT:
    
1 . No pneumothorax . 2 . Mildly improved but persistent low lung volumes .