Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . Rounded lingular opacity consistent with patient 's known lingular mass is again seen , better evaluated on CT . Bibasilar atelectasis is seen . Slight blunting of the right costophrenic angle may be due to a small pleural effusion . The cardiac and mediastinal silhouettes are stable , as are the hilar contours . Mild left base linear atelectasis is seen .
    OUTPUT:
    
Blunting of the right costophrenic angle may be due to a small pleural effusion and could be further assessed on PA and lateral views . Known lingular mass , better assessed on CT . Stable mild enlargement of the cardiac silhouette .