Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left - sided pneumothorax extending from the apex to the base with rightward shift of the mediastinum , depression of the left hemidiaphragm and expansion of the left - sided ribs . Right side is clear with no evidence of pneumothorax . The heart size is normal . Pleural surfaces are unremarkable .
    OUTPUT:
    
Left - sided tension pneumothorax . ___ medical team has been informed and chest tube was subsequently placed .