Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the immediate prior study of ___ , the right base appears slightly better aerated . The large right pleural effusion which surrounds the right lung is unchanged , with stable positioning of 2 right - sided pigtail catheters . A small amount of air is seen within the right subpleural space . There is stable mild rightward mediastinal shift . Mild left - sided early pulmonary edema is new . There is no pneumothorax or left - sided pleural effusion .
    OUTPUT:
    
1 . Slightly increased aeration of the right base . 2 . Unchanged large right - sided pleural effusion . 3 . New mild left - sided pulmonary edema .