Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are obtained . Right base opacity is similar to possibly minimally improved as compared to the prior study , given differences in inspiration , likely representing a combination of pleural effusion and atelectasis . There is slight blunting of the left costophrenic angle which may be due to a trace pleural effusion . Cardiac and mediastinal silhouettes are stable , as are the hilar contours .
    OUTPUT:
    
Stable - to - possibly mildly improved right base opacity which may represent a combination of pleural effusion and atelectasis . Small left pleural effusion .