In this pilot study, the study evaluators will evaluate the ability of positron emission tomography (PET) with 18F-fluorodeoxyglucose (FDG PET) and the computed tomography (CT) perfusion scanner, individually and combined, to predict the effectiveness of anti-angiogenic treatment.

Inclusion Criteria:

• The patient must have given their free and informed consent and signed the consent form
• The patient must be a member or beneficiary of a health insurance plan
• The patient has an WHO score ≤ 3
• The patient's estimated life expectancy is more than 3 months.
• Patient with histologically proven diagnosis of glioblastoma.
• Patient presenting with tumor progression on morphological MRI confirmed by a multidisciplinary committee.
• Patient with a unilateral supratentorial target lesion upon inclusion to establish a tumor region of interest (ROI) zone and an equivalent ROI zone in contralateral healthy tissue.
• Patient progressing after radiotherapy and at least one line of chemotherapy with TEMODAL
• Patient in whom treatment with Bevacizumab monotherapy has been validated by a multidisciplinary committee.

Exclusion Criteria:

• The subject is participating in an interventional study, or is in a period of exclusion determined by a previous study
• The subject refuses to sign the consent
• It is impossible to give the subject informed information
• The patient is under safeguard of justice or state guardianship
• Pregnant or breast feeding patients
• Hypersensitivity to iodinated contrast media and creatinine clearance less than 60 ml / minute.