FET-PET for Diagnosis and Monitoring in Patients With Low Grade Glioma

Inclusion Criteria: * neuroradiologically suspected low grade glioma (Astrocytoma WHOI-II, Oligodendroglioma WHO II, Oligoastrocytoma WHO II) * histological verification will be obtained either by microsurgery or by stereotactic biopsy * patients older than 18 years * Karnofsky Performance Score \>=70 * pregnant or nursing female patients will not be included in this study Exclusion Criteria: * patients in whom informed consent cannot be obtained due to organic brain syndrome or insufficient language skills * patients who cannot lie quiet for a time period of app. two hours during the FET-PEt scan * medical history of a metastatic brain disease * patients in whom an MRI scan cannot be performed due to claustrophobia metallic protheses or pacemakers etc.