Conventional MRI (magnetic resonance imaging) is used to confirm disc herniation of the cervical spine. Symptoms of the condition can change before they can be seen by conventional MR images. Therefore, very little gross change can be seen by conventional MRI even after 6 weeks of treatment, either medical or surgical. This study will investigate whether newer MRI techniques, diffusion tensor imaging (DTI) and tractography, are useful in demonstrating gross changes or assessing response to treatment.