Constantin Tuleasca1, Maximilien Vermandel2, Nicolas Reyns2. 1. Department of Neurosurgery and Neuro-oncology, CHU Lille, France, Department of Clinical Neurosciences, Neurosurgery Service and Gamma Knife Center, Lausanne University Hospital (CHUV), Faculty of Biology and Medicine, University of Lausanne, Switzerland. Electronic address: constantin.tuleasca@gmail.com. 2. Department of Neurosurgery and Neuro-oncology, CHU Lille, France.