Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a rounded opacity overlying the left hilum , demonstrating an internal reticular pattern , less discrete on the lateral view . There is slight leftward shift of the mediastinum and left volume loss , relating to prior left upper lobectomy . Surgical clips are again seen . The right lung is clear . There is no pneumothorax or pleural effusion . The findings are unchanged since the ___ examination .
    OUTPUT:
    
Rounded reticular opacity at the left perihilar region , unchanged since ___ , likely reflecting radiation pneumonitis given history of radiotherapy in ___ . Underlying consolidation and residual tumor can not be excluded .