T A Oyemolade1, J A Balogun2. 1. Division of Neurosurgery, Department of Surgery, Federal Medical Center, PMB 1053, Owo, Ondo State, Nigeria. toyinmolade@yahoo.com. 2. Division of Neurosurgery, Department of Surgery, College of Medicine, University of Ibadan and Department of Neurological Surgery, University College Hospital, UCH, PMB 5116, Ibadan, Nigeria.