1 Department of Neurological Science, Division of Neurosurgery, Università degli Studi di Napoli Federico II, Naples, Italy. Electronic address: dediviti@unina.it.
2 Service of Neuroradiology, Università degli Studi di Napoli Federico II, Naples, Italy.
3 Department of Neurological Science, Division of Neurosurgery, Università degli Studi di Napoli Federico II, Naples, Italy.