Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest are compared to previous chest x-ray from ___ and images from prior PET - CT from ___ . Again seen is evidence of right upper lobe scarring medially with associated volume loss . This appearance is similar compared to prior chest x-ray . Elsewhere , the lungs are clear without evidence of new consolidation or effusion . Cardiomediastinal silhouette is stable . Median sternotomy wires again seen . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Post - treatment changes seen in the right upper lung . No evidence of acute cardiopulmonary process .