Pioneering "Face Off" surgery is being used at Queen Mary Hospital in Hong Kong for a cancer operation. The radical surgery aims to rid patients of recurring nasopharyngeal cancer, a deadly disease found mostly in southern Chinese. To cut out the tumour, which forms in the centre of the head behind the nose, University of Hong Kong surgeon William Wei uses a small chainsaw to slice away half the patient's face, swing it open and pluck the tumour out. To reassemble the patient's face, he uses miniature metal plates and screws.