1. From the Department of Pathology,
2. Division of Neuropathology,
3. Department of Neurosurgery,
4. Kaplan Cancer Center, New York University Medical Center, New York, New York;
5. Department of Radiology, and
6. Department of Neurosurgery, Montreal Children's Hospital, Montreal, Quebec;
7. Department of Neurosurgery, Children's Medical Center, Medical College of Georgia, Augusta, Georgia; and
8. Institute for Neurology and Neurosurgery, Beth Israel Medical Center, New York, New York.