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FIGURE 5. MRI, 18F-FET PET, and fused images. (A) A 30-y-old man who had undergone initial surgery, radiation therapy, and intralesional radioimmunotherapy for anaplastic astrocytoma. Biopsy-proven recurrent tumor (WHO grade IV) occurred 20 mo after initial diagnosis. MRI shows no contrast enhancement and was rated normal. PET shows focal 18F-FET uptake. Maximal SUV is 3.0, with ratio of 4.0 to background. (B) A 42-y-old woman who had undergone initial surgery and radiation therapy for WHO II astrocytoma. This patient was proven free of tumor by biopsy 67 mo after initial diagnosis. MRI shows suggestive contrast enhancement at border of cavity, whereas only moderate 18F-FET uptake is present on PET. Maximal SUV is 1.7, with ratio of 1.75 to background. (Adapted from Figure 1 of (71) with the kind permission of Springer Science and Business Media.)
