Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable AP upright chest radiograph shows large right upper lobe perihilar mass with poorly defined borders with the surrounding lung parenchyma . There are emphysematous changes at the apices . Compared to the most recent plain film from ___ , there is new right pleural effusion which also appears increased compared to interim images from CT from ___ . No left pleural fluid is present . The heart and mediastinal contours show no suspicious change , and no focal bony lesions are visible .
    OUTPUT:
    
Moderate - to large - sized right pleural effusion in patient with known right lung mass .