Figure 1. (a) Coronal STIR images in a patient with neurofibromatosis and pain in the left arm. A number of small neurofibromata are visible but no identifiable cause of pain. (b) An FDG-PET scan shows a high uptake tumour in the left brachial plexus. (c) A repeat MR scan with a body coil confirms the tumour. This was surgically excised and found to be a neurofibrosarcoma.