Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate and unchanged large right apical pneumothorax . Opacification of the right middle and lower lobes is unchanged compared to prior . There is stable shift of the mediastinum to the right . The left lung is clear . The heart is grossly normal in size . A chest tube is unchanged in position .
    OUTPUT:
    
Unchanged large right apical pneumothorax . Opacification involving the right lower and middle lung zones is unchanged .