Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates a pleural drainage catheter on the left . There is a small persistent left apical pneumothorax , with some pleural effusion tracking along the left apex . Left basilar pleural effusion and left lower lobe atelectasis appears unchanged . The right lung is grossly clear .
    OUTPUT:
    
1 . Small persistent left apical pneumothorax , similar in size to prior . 2 . Unchanged appearance of left - sided pleural effusion left lower lobe atelectasis .