Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate persistent large right perihilar mass , which is slightly larger as compared to the prior study . This is in a region of prior fiducial seed placement , and may correspond to post-radiation changes ; however , recurrence of malignancy can not be excluded . Again seen are heterogeneous opacities at the right base , with a small right - sided pleural effusion . The left lung is essentially clear . The cardiomediastinal and hilar contours are unchanged . There is no pneumothorax or focal consolidation .
    OUTPUT:
    
1 . Persistent large right perihilar mass , which is slightly larger as compared to the prior study . This is in a region of prior fiducial seed placement , and may correspond to post-radiation changes ; however , recurrence of malignancy can not be excluded . Recommend dedicated CT of the chest for additional evaluation . 2 . No pneumonia .