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Figure 6. (a) This man had a previously radiotherapy treated glioblastoma multiforme in the left parieto-occipital region. A T1W axial series showed a ring-enhancing lesion at the site of the previous tumour. The concern was whether this was recurrence of the tumour or radiation necrosis. (b) The PET scan (methionine above and FDG below) showed uptake in the abnormality, indicating it was likely to be tumour recurrence. This was confirmed by biopsy and the patient subsequently died from progression of the tumour.
