Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Large rounded area of opacity involving the lingula and likely left upper lobe consistent with patient 's known underlying mass . Superimposed infection is difficult to entirely exclude . The right lung is clear . There is no pleural effusion . The thorax is seen . Mediastinal contours are unremarkable . The cardiac silhouette is not enlarged .
    OUTPUT:
    
Large left - sided pulmonary opacity , consistent with patient 's known pulmonary mass .