Fig. 17
From: Non-FDG PET/CT in Diagnostic Oncology: a pictorial review
11C-Methionine, suspicion of recurrence. Clinical history: 41 y.o. male. Left frontal grade III oligoastrocytoma partially removed and treated with radiotherapy and chemotherapy. Asymptomatic for 3 years until relapse. After chemotherapy, MRI showed tumour growth, nodule in external surgical cavity wall, multiple Gd positive foci in left frontal lobe and a smaller one right anterior parasagittal. It is not possible to differentiate between gliosis or relapse (a). PET/CT findings: intense 11C-Methionine uptake in left frontal lobe related to tumour relapse, which extends to adjacent white matter (b)