You will have a MRI of the spine within 1 month before registration on this study. You will also fill out a health survey, a symptom inventory, and a Brief Pain Inventory within 1 week before registration. Each of these surveys should take about 5 minutes to complete. You will have a CT-simulation. The simulation is like a CT scan where a special body frame is used to keep you from moving during scanning and later radiation treatment. However, no radiation is delivered during the simulation. You will be asked questions about your medical history and have a complete neurological exam during your first consultation, before registration. The neurological exam involves testing upper and lower motor strength, sensation to light touch, reflexes, a mental exam, and an evaluation of the way you walk.