Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large right - sided pleural effusion with opacification of the right lower hemithorax . There is a small amount of aerated lung that can be seen through this region . The right upper lung and left lung have minimal increase in lung markings but no focal infiltrate . Cardiac and mediastinal silhouettes are normal .
    OUTPUT:
    
Large right - sided effusion .