1. Department of Neurosurgery, CHU Nancy, Nancy, France
2. Department of Neuropathology, CHU de Montpellier, Montpellier, France
3. Department of Neurooncology, ICM, Montpellier, France
4. Department of Neuropathology, CHU Nancy, Nancy, France
5. Department of Neurooncology, CHU Poitiers, Poitiers, France
6. Department of Neurosurgery, Montpellier University Medical Center, Montpellier, France