Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Status post right upper lobe mass removed via lobectomy . Elevation of the right hemidiaphragm is likely secondary to volume loss and is stable over multiple prior studies . Opacity at the right hilum is likely due to atelectasis . Otherwise , the lungs are clear without focal opacities , pleural effusion or pneumothorax . The cardiac and mediastinal contours are stable . The air in the soft tissues overlying the right chest is likely related to a prior chest tube .
    OUTPUT:
    
No pneumothorax . Right hilar opacity is most consistent with atelectasis .