Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior chest radiograph , chain sutures and linear scarring are again seen in the right upper lobe , similar prior studies . The heart size is normal , with dense mitral annular calcifications . Mediastinal and hilar contours are unchanged . Re demonstration of a small hiatal hernia . No focal consolidation or pneumothorax . Within the limitations of chest radiography , no acute osseous abnormality detected . Multilevel degenerative changes and osteopenia noted in the visualized thoracic spine .
    OUTPUT:
    
1 . Within the limitation of chest radiography , no acute osseous abnormalities . No evidence of pneumothorax . 2 . Postoperative scarring in right upper lobe .