Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two views of the chest were obtained . Re-demonstration of large left perihilar mass which appears unchanged since prior examination dated ___ . No new focal consolidation is identified . There is no pleural effusion or pneumothorax . Visualized osseous structures demonstrate no acute abnormality .
    OUTPUT:
    
No focal consolidation convincing for infective process . Re-demonstration of left perihilar mass present and better delineated on CT chest dated ___ .