MENINGIOMA SURGERY. Photo essay at La Louviere clinic, France. Neurosurgery. Ablation of a cerebral tumor (here an agressive meningioma) assisted by a neuronavigation. The neuronavigation, the same way as a GPS, permits from a pre-established MRI, to locate in the space the position of patient in the surgery room. The aquisition of targeting data for the craniotomy is then facilitated. After the aperture of the cranial box, the neurosurgeon starts by removing the part of the meninges inve