PDT of neurofibroma. A: Intra-operative image showing the large mass of the left neck. B: Intra-operative ultrasonography assessing the centre and periphery of the lesion as well as any neurovascular involvement or involvement of hollow organs. C and D: On-table US images showing the neurofibroma and its boundaries. E: Needle insertion into lesion prior to fibre insertion. F and G: light delivery to initiate the photochemical reaction.