Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right apical dominant mass seen on prior PET - CT is not well appreciated on the chest radiograph . Volume loss in the right upper lobe and scarring is noted as well as perihilar opacities that correspond to interlobular septal thickening ground - glass opacities and the PET - CT . There is a moderate right pleural effusion , layering as compared to the prior PET - CT , although difficult to compare across modalities . The left lung is clear and there is no left pleural effusion . Heart size is normal . No pneumothorax .
    OUTPUT:
    
Moderate right pleural effusion . Scarring and volume loss in the right upper lobe . Right perihilar fullness corresponds to possible lymphangitic spread of tumor on recent PET - CT .