Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . As previously seen there is slight blunting of the posterior left costophrenic angle , could be due to pleural thickening versus trace pleural effusion . Otherwise , no large pleural effusion is seen . There is no pneumothorax . The cardiac and mediastinal silhouettes are stable with the aorta unfolded and the cardiac silhouette top normal to mildly enlarged .
    OUTPUT:
    
Slight blunting of the posterior left costophrenic angle could be due to pleural thickening versus trace pleural effusion .