Fig. 10

¹⁸F-FET, suspicion of recurrence. Clinical history: 55 y.o. woman, with grade II–III oligo-astrocytoma treated by surgery and adjuvant radiation therapy 13 months prior. MRI shows a focal area of Gd enhancement but no corresponding perfusion anomaly, consistent with radiation necrosis (a). PET/CT findings: highly increased FET uptake in the lesion, consistent with persistent/recurrent tumour on PET and fused images (b). Surgery revealed grade II oligo-astrocytoma