Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Right mid lung mass with fiducial markers appears similar in appearance compared to prior . There is associated right - sided volume loss with shifting of the airway and elevation of the right hemidiaphragm . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is stable . There is no effusion . No acute osseous abnormality is identified . Lower cervical upper thoracic anterior vertebral body fixation is again seen .
    OUTPUT:
    
Right mid lung opacity with post-treatment changes is identified . Evaluation for subtle change / tumor is not possible and CT would be necessary . There is no definite acute superimposed process .