Stock Photo - <BR>Photo essay at La Louviere clinic, France.<BR>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 invested by the meningioma then remove the tumor that compresses the brain. The meningioma has not affected the cortical part, only a few arteries and veins have been « requisitionned » by the tumor here is why its designation of « agressive meningioma ». This sort of tumor appear more frequently on the menopaused patient because of the hormonal disturbances. Here, incision and detachment of the scalp.