Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi upright radiograph of the chest demonstrates new placement of a left - sided chest tube . There has been interval decrease in size of the left pneumothorax . There is persistent but improved shift of the mediastinum to the right . There are increased interstitial markings in the bilateral lungs . There is a moderate left - sided pleural effusion . The cardiomediastinal and hilar contours are unchanged .
    OUTPUT:
    
Interval decrease in size of the left pneumothorax status post left - sided chest tube placement .