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FIGURE 4. MRI and 18F-FDG PET of recurrent tumors. (A) Anaplastic transformation in previously resected and irradiated grade II astrocytoma. Intense 18F-FDG uptake corresponds to new contrast-enhancing lesion on MRI. (B) Recurrent grade II oligodendroglioma. No increased 18F-FDG uptake is seen. (C) Patient with previously resected and irradiated right frontal grade II astrocytoma. New contrast-enhancing lesion in left frontal lobe corresponds to minimally increased 18F-FDG uptake. This lesion was resected, and grade IV tumor was found.
