Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post right upper lobectomy . Persistent postoperative changes at the right hilum are unchanged since most recent examinations and smaller when compared to radiographs obtained ___ , most probably a fluid collection . Lungs are otherwise clear with no focal opacity convincing for pneumonia . There is no pleural effusion or pneumothorax . The heart appears within normal limits .
    OUTPUT:
    
1 . Status post right upper lobectomy with persistent postoperative changes at the right hilum . Opacity at the right hilum is decreased since ___ examination , probably reflective of a fluid collection at the surgical site . 2 . No evidence to suggest pneumonia .