Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is performed with the next preceding similar study of ___ . Heart size and mediastinal structures unchanged . On the right base , the previously described two pleural chest tubes remain in unaltered position . The degree of pleural densities blunting the lateral and posterior pleural sinus has regressed mildly . No new pulmonary abnormalities are present . No pneumothorax has developed . Left - sided hemithorax is unremarkable as before .
    OUTPUT:
    
Mild regression of pleural densities right base in a patient with known empyema , still with chest two draining and tubes . No pneumothorax .