Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Post - surgical changes in the right hilus and mildly elevated right hemidiaphragm following right upper lobectomy is unchanged . Mild atelectasis in the right middle lobe is new . No opacities concerning for pneumonia . There is no pleural effusion . Heart size is normal . Mediastinal contours are unchanged .
    OUTPUT:
    
1 . Mild atelectasis in the middle lobe , new since ___ . 2 . Stable changes in the right hemithorax following right upper lobectomy .