Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs are provided . A large left perihilar mass is again visualized , compatible with known mass . There are innumerable nodules as seen on the prior radiograph CT scan . There is no focal consolidation , pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal . Osseous structures are intact . There are degenerative changes throughout the thoracic spine .
    OUTPUT:
    
Mass in left perihilar region with multiple nodules compatible with patient 's known metastatic lung cancer . No superimposed pneumonia or CHF .