1. From the Division of Neurosurgery, College of Medicine, King Saud University, Riyadh
2. From the Division of Radiology, College of Medicine, King Saud University, Riyadh
3. From the Department of Pathology, College of Medicine, King Saud University, Riyadh
4. From the Division of Neurology, College of Medicine, King Saud University, Riyadh