1 Department of Surgery, Division of Neurosurgery, Gaffrée e Guinle University Hospital, School of Medicine, Federal University of Rio de Janeiro State (UNIRIO), 775 Mariz e Barros Street, Rio de Janeiro, RJ, 20270-901, Brazil. neuroguedes@yahoo.com.br.
2 Department of Surgery, Division of Neurosurgery, Gaffrée e Guinle University Hospital, School of Medicine, Federal University of Rio de Janeiro State (UNIRIO), 775 Mariz e Barros Street, Rio de Janeiro, RJ, 20270-901, Brazil.
3 Department of Pathology, Antônio Pedro University Hospital, Fluminense Federal University (UFF), Niterói, RJ, Brazil.
4 Department of Surgery, Gaffrée e Guinle University Hospital, School of Medicine, Federal University of Rio de Janeiro State (UNIRIO), Rio de Janeiro, RJ, Brazil.